PROBLEMS 129 KB
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This file describes various problems that have been encountered
in compiling, installing and running GNU Emacs.

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* Mule-UCS loads very slowly.

Changes to Emacs internals interact badly with Mule-UCS's `un-define'
library, which is the usual interface to Mule-UCS.  Apply the
following patch to Mule-UCS 0.84 and rebuild it.  That will help,
though loading will still be slower than in Emacs 20.  (Some
distributions, such as Debian, may already have applied such a patch.)

--- lisp/un-define.el	6 Mar 2001 22:41:38 -0000	1.30
+++ lisp/un-define.el	19 Apr 2002 18:34:26 -0000
@@ -610,13 +624,21 @@ by calling post-read-conversion and pre-
 
  (mapcar
   (lambda (x)
-    (mapcar
-     (lambda (y)
-       (mucs-define-coding-system
-	(nth 0 y) (nth 1 y) (nth 2 y)
-	(nth 3 y) (nth 4 y) (nth 5 y) (nth 6 y))
-       (coding-system-put (car y) 'alias-coding-systems (list (car x))))
-     (cdr x)))
+    (if (fboundp 'register-char-codings)
+	;; Mule 5, where we don't need the eol-type specified and
+	;; register-char-codings may be very slow for these coding
+	;; system definitions.
+	(let ((y (cadr x)))
+	  (mucs-define-coding-system
+	   (car x) (nth 1 y) (nth 2 y)
+	   (nth 3 y) (nth 4 y) (nth 5 y)))
+      (mapcar
+       (lambda (y)
+	 (mucs-define-coding-system
+	  (nth 0 y) (nth 1 y) (nth 2 y)
+	  (nth 3 y) (nth 4 y) (nth 5 y) (nth 6 y))
+	 (coding-system-put (car y) 'alias-coding-systems (list (car x)))))
+      (cdr x)))
   `((utf-8
      (utf-8-unix
       ?u "UTF-8 coding system"

Note that Emacs has native support for Unicode, roughly equivalent to
Mule-UCS's, so you may not need it.

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* Building Emacs with GCC 2.9x fails in the `src' directory.

This may happen if you use a development version of GNU `cpp' from one
of the GCC snapshots between Oct 2000 and Feb 2001, or from a released
version of GCC newer than 2.95.2 which was prepared around those
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dates; similar problems were reported with some snapshots of GCC 3.1
around Sep 30 2001.  The preprocessor in those versions is
incompatible with a traditional Unix cpp (e.g., it expands ".." into
". .", which breaks relative file names that reference the parent
directory; or inserts TAB characters before lines that set Make
variables).
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The solution is to make sure the preprocessor is run with the
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`-traditional' option.  The `configure' script does that automatically
when it detects the known problems in your cpp, but you might hit some
unknown ones.  To force the `configure' script to use `-traditional',
run the script like this:

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  CPP='gcc -E -traditional' ./configure ...
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(replace the ellipsis "..." with any additional arguments you pass to
the script).
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Note that this problem does not pertain to the MS-Windows port of
Emacs, since it doesn't use the preprocessor to generate Makefiles.

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* Building Emacs with a system compiler fails to link because of an
undefined symbol such as __eprintf which does not appear in Emacs.
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This can happen if some of the libraries linked into Emacs were built
with GCC, but Emacs itself is being linked with a compiler other than
GCC.  Object files compiled with GCC might need some helper functions
from libgcc.a, the library which comes with GCC, but the system
compiler does not instruct the linker to search libgcc.a during the
link stage.

A solution is to link with GCC, like this:

  	make CC=gcc

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Since the .o object files already exist, this will not recompile Emacs
with GCC, but just restart by trying again to link temacs.

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* Building the MS-Windows port with Cygwin GCC can fail.

Emacs may not build using recent Cygwin builds of GCC, such as Cygwin
version 1.1.8, using the default configure settings.  It appears to be
necessary to specify the -mwin32 flag when compiling, and define
__MSVCRT__, like so:

  configure --with-gcc --cflags -mwin32 --cflags -D__MSVCRT__

* Building the MS-Windows port with Leim fails in the `leim' directory.
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The error message might be something like this:

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 Converting d:/emacs-21.3/leim/CXTERM-DIC/4Corner.tit to quail-package...
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 Invalid ENCODE: value in TIT dictionary
 NMAKE : fatal error U1077: '"../src/obj-spd/i386/emacs.exe"' : return code
       '0xffffffff'
 Stop.

This can happen if the Leim distribution is unpacked with a program
which converts the `*.tit' files to DOS-style CR-LF text format.  The
`*.tit' files in the leim/CXTERM-DIC directory require Unix-style line
endings to compile properly, because Emacs reads them without any code
or EOL conversions.

The solution is to make sure the program used to unpack Leim does not
change the files' line endings behind your back.  The GNU FTP site has
in the `/gnu/emacs/windows' directory a program called `djtarnt.exe'
which can be used to unpack `.tar.gz' and `.zip' archives without
mangling them.

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* Emacs crashes when dumping itself on Mac PPC running Yellow Dog GNU/Linux.

The crashes happen inside the function Fmake_symbol; here's a typical
C backtrace printed by GDB:

  0x190c0c0 in Fmake_symbol ()
  (gdb) where
  #0  0x190c0c0 in Fmake_symbol ()
  #1  0x1942ca4 in init_obarray ()
  #2  0x18b3500 in main ()
  #3  0x114371c in __libc_start_main (argc=5, argv=0x7ffff5b4, envp=0x7ffff5cc,

This could happen because GCC version 2.95 and later changed the base
of the load address to 0x10000000.  Emacs needs to be told about this,
but we currently cannot do that automatically, because that breaks
other versions of GNU/Linux on the MacPPC.  Until we find a way to
distinguish between the Yellow Dog and the other varieties of
GNU/Linux systems on the PPC, you will have to manually uncomment the
following section near the end of the file src/m/macppc.h in the Emacs
distribution:

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  #if 0  /* This breaks things on PPC GNU/Linux except for Yellowdog,
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	    even with identical GCC, as, ld.  Let's take it out until we
	    know what's really going on here.  */
  /* GCC 2.95 and newer on GNU/Linux PPC changed the load address to
     0x10000000.  */
  #if defined __linux__
  #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
  #define DATA_SEG_BITS  0x10000000
  #endif
  #endif
  #endif /* 0 */

Remove the "#if 0" and "#endif" directives which surround this, save
the file, and then reconfigure and rebuild Emacs.  The dumping process
should now succeed.

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* JPEG images aren't displayed.

This has been reported when Emacs is built with jpeg-6a library.
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Upgrading to jpeg-6b solves the problem.  Configure checks for the
correct version, but this problem could occur if a binary built
against a shared libjpeg is run on a system with an older version.
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* Building `ctags' for MS-Windows with the MinGW port of GCC fails.

This might happen due to a bug in the MinGW header assert.h, which
defines the `assert' macro with a trailing semi-colon.  The following
patch to assert.h should solve this:

*** include/assert.h.orig	Sun Nov  7 02:41:36 1999
--- include/assert.h	Mon Jan 29 11:49:10 2001
***************
*** 41,47 ****
  /*
   * If not debugging, assert does nothing.
   */
! #define assert(x)	((void)0);
  
  #else /* debugging enabled */
  
--- 41,47 ----
  /*
   * If not debugging, assert does nothing.
   */
! #define assert(x)	((void)0)
  
  #else /* debugging enabled */
  

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* Improving performance with slow X connections

If you don't need X Input Methods (XIM) for entering text in some
language you use, you can improve performance on WAN links by
configuring Emacs with option `--without-xim'.  Configuring Emacs
without XIM does not affect the use of Emacs' own input methods, which
are part of the Leim package.

If the connection is very slow, you might also want to consider
switching off scroll bars, menu bar, and tool bar.

* Getting a Meta key on the FreeBSD console

By default, neither Alt nor any other key acts as a Meta key on
FreeBSD, but this can be changed using kbdcontrol(1).  Dump the
current keymap to a file with the command

  $ kbdcontrol -d >emacs.kbd

Edit emacs.kbd, and give the key you want to be the Meta key the
definition `meta'.  For instance, if your keyboard has a ``Windows''
key with scan code 105, change the line for scan code 105 in emacs.kbd
to look like this

  105   meta   meta   meta   meta   meta   meta   meta   meta    O

to make the Windows key the Meta key.  Load the new keymap with

  $ kbdcontrol -l emacs.kbd

* Emacs' xterm-mouse-mode doesn't work on the Gnome terminal.

A symptom of this bug is that double-clicks insert a control sequence
into the buffer.  The reason this happens is an apparent
incompatibility of the Gnome terminal with Xterm, which also affects
other programs using the Xterm mouse interface.  A problem report has
been filed.

* Emacs pauses for several seconds when changing the default font

This has been reported for fvwm 2.2.5 and the window manager of KDE
2.1.  The reason for the pause is Xt waiting for a ConfigureNotify
event from the window manager, which the window manager doesn't send.
Xt stops waiting after a default timeout of usually 5 seconds.

A workaround for this is to add something like

emacs.waitForWM: false

to your X resources.  Alternatively, add `(wait-for-wm . nil)' to a
frame's parameter list, like this:

   (modify-frame-parameters nil '((wait-for-wm . nil)))

(this should go into your `.emacs' file).

* Underlines appear at the wrong position.

This is caused by fonts having a wrong UNDERLINE_POSITION property.
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Examples are the font 7x13 on XFree prior to version 4.1, or the jmk
neep font from the Debian xfonts-jmk package.  To circumvent this
problem, set x-use-underline-position-properties to nil in your
`.emacs'.

To see what is the value of UNDERLINE_POSITION defined by the font,
type `xlsfonts -lll FONT' and look at the font's UNDERLINE_POSITION
property.
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* When using Xaw3d scroll bars without arrows, the very first mouse
click in a scroll bar might be ignored by the scroll bar widget.  This
is probably a bug in Xaw3d; when Xaw3d is compiled with arrows, the
problem disappears.

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* There are known binary incompatibilities between Xaw, Xaw3d, neXtaw,
XawM and the few other derivatives of Xaw.  So when you compile with
one of these, it may not work to dynamically link with another one.
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For example, strange problems, such as Emacs exiting when you type
"C-x 1", were reported when Emacs compiled with Xaw3d and libXaw was
used with neXtaw at run time.

The solution is to rebuild Emacs with the toolkit version you actually
want to use, or set LD_PRELOAD to preload the same toolkit version you
built Emacs with.
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* Clicking C-mouse-2 in the scroll bar doesn't split the window.

This currently doesn't work with scroll-bar widgets (and we don't know
a good way of implementing it with widgets).  If Emacs is configured
--without-toolkit-scroll-bars, C-mouse-2 on the scroll bar does work.

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* Emacs aborts inside the function `tparam1'.

This can happen if Emacs was built without terminfo support, but the
terminal's capabilities use format that is only supported by terminfo.
If your system has ncurses installed, this might happen if your
version of ncurses is broken; upgrading to a newer version of ncurses
and reconfiguring and rebuilding Emacs should solve this.

All modern systems support terminfo, so even if ncurses is not the
problem, you should look for a way to configure Emacs so that it uses
terminfo when built.

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* Error messages about undefined colors on X.

The messages might say something like this:

   Unable to load color "grey95"

(typically, in the `*Messages*' buffer), or something like this:

  Error while displaying tooltip: (error Undefined color lightyellow)

These problems could happen if some other X program has used up too
many colors of the X palette, leaving Emacs with insufficient system
resources to load all the colors it needs.

A solution is to exit the offending X programs before starting Emacs.

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* Colors are not available on a tty or in xterm.

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Emacs 21 supports colors on character terminals and terminal
emulators, but this support relies on the terminfo or termcap database
entry to specify that the display supports color.  Emacs looks at the
"Co" capability for the terminal to find out how many colors are
supported; it should be non-zero to activate the color support within
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Emacs.  (Most color terminals support 8 or 16 colors.)  If your system
uses terminfo, the name of the capability equivalent to "Co" is
"colors".

In addition to the "Co" capability, Emacs needs the "op" (for
``original pair'') capability, which tells how to switch the terminal
back to the default foreground and background colors.  Emacs will not
use colors if this capability is not defined.  If your terminal entry
doesn't provide such a capability, try using the ANSI standard escape
sequence \E[00m (that is, define a new termcap/terminfo entry and make
it use your current terminal's entry plus \E[00m for the "op"
capability).

Finally, the "NC" capability (terminfo name: "ncv") tells Emacs which
attributes cannot be used with colors.  Setting this capability
incorrectly might have the effect of disabling colors; try setting
this capability to `0' (zero) and see if that helps.
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Emacs uses the database entry for the terminal whose name is the value
of the environment variable TERM.  With `xterm', a common terminal
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entry that supports color is `xterm-color', so setting TERM's value to
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`xterm-color' might activate the color support on an xterm-compatible
emulator.
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Beginning with version 21.3, Emacs supports the --color command-line
option which may be used to force Emacs to use one of a few popular
modes for getting colors on a tty.  For example, --color=ansi8 sets up
for using the ANSI-standard escape sequences that support 8 colors.

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Some modes do not use colors unless you turn on the Font-lock mode.
Some people have long ago set their `~/.emacs' files to turn on
Font-lock on X only, so they won't see colors on a tty.  The
recommended way of turning on Font-lock is by typing "M-x
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global-font-lock-mode RET" or by customizing the variable
`global-font-lock-mode'.
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* Emacs on a tty switches the cursor to large blinking block.

This was reported to happen on some GNU/Linux systems which use
ncurses version 5.0, but could be relevant for other versions as well.
These versions of ncurses come with a `linux' terminfo entry, where
the "cvvis" capability (termcap "vs") is defined as "\E[?25h\E[?8c"
(show cursor, change size).  This escape sequence switches on a
blinking hardware text-mode cursor whose size is a full character
cell.  This blinking cannot be stopped, since a hardware cursor
always blinks.

A work-around is to redefine the "cvvis" capability so that it
enables a *software* cursor.  The software cursor works by inverting
the colors of the character at point, so what you see is a block
cursor that doesn't blink.  For this to work, you need to redefine
the "cnorm" capability as well, so that it operates on the software
cursor instead of the hardware cursor.

To this end, run "infocmp linux > linux-term", edit the file
`linux-term' to make both the "cnorm" and "cvvis" capabilities send
the sequence "\E[?25h\E[?17;0;64c", and then run "tic linux-term" to
produce a modified terminfo entry.

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Alternatively, if you want a blinking underscore as your Emacs cursor,
change the "cvvis" capability to send the "\E[?25h\E[?0c" command.

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* Problems in Emacs built with LessTif.

The problems seem to depend on the version of LessTif and the Motif
emulation for which it is set up.

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Only the Motif 1.2 emulation seems to be stable enough in LessTif.
Lesstif 0.92-17's Motif 1.2 emulation seems to work okay on FreeBSD.
On GNU/Linux systems, lesstif-0.92.6 configured with "./configure
--enable-build-12 --enable-default-12" is reported to be the most
successful.  The binary GNU/Linux package
lesstif-devel-0.92.0-1.i386.rpm was reported to have problems with
menu placement.
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On some systems, even with Motif 1.2 emulation, Emacs occasionally
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locks up, grabbing all mouse and keyboard events.  We still don't know
what causes these problems; they are not reproducible by Emacs
developers.
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* Known problems with the MS-Windows port of Emacs 21.2.
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Frames are not refreshed while the File or Font dialog or a pop-up menu
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is displayed. This also means help text for pop-up menus is not
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displayed at all.  This is because message handling under Windows is
synchronous, so we cannot handle repaint (or any other) messages while
waiting for a system function to return the result of the dialog or
pop-up menu interaction.
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Windows 95 and Windows NT up to version 4.0 do not support help text
for menus.  Help text is only available in later versions of Windows.

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There are problems with display if mouse-tracking is enabled and the
mouse is moved off a frame, over another frame then back over the first
frame.  A workaround is to click the left mouse button inside the frame
after moving back into it.
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Some minor flickering still persists during mouse-tracking, although
not as severely as in 21.1.
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Emacs can sometimes abort when non-ASCII text, possibly with null
characters, is copied and pasted into a buffer.

An inactive cursor remains in an active window after the Windows
Manager driven switch of the focus, until a key is pressed.

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Windows input methods are not recognized by Emacs (as of v21.2).  Some
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of these input methods cause the keyboard to send characters encoded
in the appropriate coding system (e.g., ISO 8859-1 for Latin-1
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characters, ISO 8859-8 for Hebrew characters, etc.).  To make this
work, set the keyboard coding system to the appropriate value after
you activate the Windows input method.  For example, if you activate
the Hebrew input method, type "C-x RET k iso-8859-8 RET".  (Emacs
ought to recognize the Windows language-change event and set up the
appropriate keyboard encoding automatically, but it doesn't do that
yet.)

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Windows uses UTF-16 encoding to deal with multilingual text (text not
encodable in the `system codepage') in the clipboard.  To deal with
this, load the library `utf-16' and use `set-selection-coding-system'
to set the clipboard coding system to `utf-16-le-dos'.  This won't
cope with Far Eastern (`CJK') text; if necessary, install the Mule-UCS
package (see etc/MORE.STUFF), whose `utf-16-le-dos' coding system does
encode a lot of CJK characters.
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The %b specifier for format-time-string does not produce abbreviated
month names with consistent widths for some locales on some versions
of Windows. This is caused by a deficiency in the underlying system
library function.
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* The `configure' script doesn't find the jpeg library.

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There are reports that this happens on some systems because the linker
by default only looks for shared libraries, but jpeg distribution by
default only installs a nonshared version of the library, `libjpeg.a'.

If this is the problem, you can configure the jpeg library with the
`--enable-shared' option and then rebuild libjpeg.  This produces a
shared version of libjpeg, which you need to install.  Finally, rerun
the Emacs configure script, which should now find the jpeg library.
Alternatively, modify the generated src/Makefile to link the .a file
explicitly.
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* Building Emacs over NFS fails with ``Text file busy''.

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This was reported to happen when building Emacs on a GNU/Linux system
(RedHat Linux 6.2) using a build directory automounted from Solaris
(SunOS 5.6) file server, but it might not be limited to that
configuration alone.  Presumably, the NFS server doesn't commit the
files' data to disk quickly enough, and the Emacs executable file is
left ``busy'' for several seconds after Emacs has finished dumping
itself.  This causes the subsequent commands which invoke the dumped
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Emacs executable to fail with the above message.
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In some of these cases, a time skew between the NFS server and the
machine where Emacs is built is detected and reported by GNU Make
(it says that some of the files have modification time in the future).
This might be a symptom of NFS-related problems.

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If the NFS server runs on Solaris, apply the Solaris patch 105379-05
(Sunos 5.6: /kernel/misc/nfssrv patch).  If that doesn't work, or if
you have a different version of the OS or the NFS server, you can
force the NFS server to use 1KB blocks, which was reported to fix the
problem albeit at a price of slowing down file I/O.  You can force 1KB
blocks by specifying the "-o  rsize=1024,wsize=1024" options to the
`mount' command, or by adding ",rsize=1024,wsize=1024" to the mount
options in the appropriate system configuration file, such as
`/etc/auto.home'.

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Alternatively, when Make fails due to this problem, you could wait for
a few seconds and then invoke Make again.  In one particular case,
waiting for 10 or more seconds between the two Make invocations seemed
to work around the problem.
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Similar problems can happen if your machine NFS-mounts a directory
onto itself.  Suppose the Emacs sources live in `/usr/local/src' and
you are working on the host called `marvin'.  Then an entry in the
`/etc/fstab' file like the following is asking for trouble:

    marvin:/usr/local/src /usr/local/src ...options.omitted...

The solution is to remove this line from `etc/fstab'.

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* Emacs binary is not in executable format, and cannot be run.

This was reported to happen when Emacs is built in a directory mounted
via NFS.  Usually, the file `emacs' produced in these cases is full of
binary null characters, and the `file' utility says:

    emacs: ASCII text, with no line terminators

We don't know what exactly causes this failure.  A work-around is to
build Emacs in a directory on a local disk.

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* Accented ISO-8859-1 characters are displayed as | or _.
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Try other font set sizes (S-mouse-1).  If the problem persists with
other sizes as well, your text is corrupted, probably through software
that is not 8-bit clean.  If the problem goes away with another font
size, it's probably because some fonts pretend to be ISO-8859-1 fonts
when they are really ASCII fonts. In particular the schumacher-clean
fonts have this bug in some versions of X.

To see what glyphs are included in a font, use `xfd', like this:

  xfd -fn -schumacher-clean-medium-r-normal--12-120-75-75-c-60-iso8859-1

If this shows only ASCII glyphs, the font is indeed the source of the
problem.

The solution is to remove the corresponding lines from the appropriate
`fonts.alias' file, then run `mkfontdir' in that directory, and then run
`xset fp rehash'.

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* Large file support is disabled on HP-UX.  See the comments in
src/s/hpux10.h.

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* Crashes when displaying GIF images in Emacs built with version
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libungif-4.1.0 are resolved by using version libungif-4.1.0b1.
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Configure checks for the correct version, but this problem could occur
if a binary built against a shared libungif is run on a system with an
older version.
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* Font Lock displays portions of the buffer in incorrect faces.
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By far the most frequent cause of this is a parenthesis `(' or a brace
`{' in column zero.  Font Lock assumes that such a paren is outside of
any comment or string.  This is of course not true in general, but the
vast majority of well-formatted program source files don't have such
parens, and therefore this assumption is used to allow optimizations
in Font Lock's syntactical analysis.  These optimizations avoid some
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pathological cases where jit-lock, the Just-in-Time fontification
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introduced with Emacs 21.1, could significantly slow down scrolling
through the buffer, especially scrolling backwards, and also jumping
to the end of a very large buffer.

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Beginning with version 21.3, a parenthesis or a brace in column zero
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is highlighted in bold-red face if it is inside a string or a comment,
to indicate that it could interfere with Font Lock (and also with
indentation) and should be moved or escaped with a backslash.
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If you don't use large buffers, or have a very fast machine which
makes the delays insignificant, you can avoid the incorrect
fontification by setting the variable
`font-lock-beginning-of-syntax-function' to a nil value.  (This must
be done _after_ turning on Font Lock.)

Another alternative is to avoid a paren in column zero.  For example,
in a Lisp string you could precede the paren with a backslash.

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* When running on KDE, colors or fonts are not as specified for Emacs,
or messed up.

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For example, you could see background you set for Emacs only in the
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empty portions of the Emacs display, while characters have some other
background.

This happens because KDE's defaults apply its color and font
definitions even to applications that weren't compiled for KDE.  The
solution is to uncheck the "Apply fonts and colors to non-KDE apps"
option in Preferences->Look&Feel->Style.

Alternatively, if you do want the KDE defaults to apply to other
applications, but not to Emacs, you could modify the file `Emacs.ad'
(should be in the `/usr/share/apps/kdisplay/app-defaults/' directory)
so that it doesn't set the default background and foreground only for
Emacs.  For example, make sure the following resources are either not
present or commented out:

   Emacs.default.attributeForeground
   Emacs.default.attributeBackground
   Emacs*Foreground
   Emacs*Background

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* Interrupting Cygwin port of Bash from Emacs doesn't work.

Cygwin 1.x builds of the ported Bash cannot be interrupted from the
MS-Windows version of Emacs.  This is due to some change in the Bash
port or in the Cygwin library which apparently make Bash ignore the
keyboard interrupt event sent by Emacs to Bash.  (Older Cygwin ports
of Bash, up to b20.1, did receive SIGINT from Emacs.)

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* Dired is very slow.

This could happen if invocation of the `df' program takes a long
time.  Possible reasons for this include:

  - ClearCase mounted filesystems (VOBs) that sometimes make `df'
    response time extremely slow (dozens of seconds);

  - slow automounters on some old versions of Unix;

  - slow operation of some versions of `df'.

To work around the problem, you could either (a) set the variable
`directory-free-space-program' to nil, and thus prevent Emacs from
invoking `df'; (b) use `df' from the GNU Fileutils package; or
(c) use CVS, which is Free Software, instead of ClearCase.

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* Accessing remote files with ange-ftp hangs the MS-Windows version of Emacs.

If the FTP client is the Cygwin port of GNU `ftp', this appears to be
due to some bug in the Cygwin DLL or some incompatibility between it
and the implementation of asynchronous subprocesses in the Windows
port of Emacs.  Specifically, some parts of the FTP server responses
are not flushed out, apparently due to buffering issues, which
confuses ange-ftp.

The solution is to downgrade to an older version of the Cygwin DLL
(version 1.3.2 was reported to solve the problem), or use the stock
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Windows FTP client, usually found in the `C:\WINDOWS' or 'C:\WINNT'
directory.  To force ange-ftp use the stock Windows client, set the
variable `ange-ftp-ftp-program-name' to the absolute file name of the
client's executable.  For example:
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 (setq ange-ftp-ftp-program-name "c:/windows/ftp.exe")

If you want to stick with the Cygwin FTP client, you can work around
this problem by putting this in your `.emacs' file:

 (setq ange-ftp-ftp-program-args '("-i" "-n" "-g" "-v" "--prompt" "")

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* Versions of the W3 package released before Emacs 21.1 don't run
under Emacs 21.  This fixed in W3 version 4.0pre.47.
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* On AIX, if linking fails because libXbsd isn't found, check if you
are compiling with the system's `cc' and CFLAGS containing `-O5'.  If
so, you have hit a compiler bug.  Please make sure to re-configure
Emacs so that it isn't compiled with `-O5'.

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* Compiling on AIX 4.3.x or 4.4 fails.
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This could happen if you use /bin/c89 as your compiler, instead of
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the default `cc'.  /bin/c89 treats certain warnings, such as benign
redefinitions of macros, as errors, and fails the build.  A solution
is to use the default compiler `cc'.

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* Old versions of the PSGML package use the obsolete variables
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`before-change-function' and `after-change-function', which are no
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longer used by Emacs.  Please use PSGML 1.2.3 or later.
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* PSGML conflicts with sgml-mode.

PSGML package uses the same names of some variables (like keymap)
as built-in sgml-mode.el because it was created as a replacement
of that package.  The conflict will be shown if you load
sgml-mode.el before psgml.el.  E.g. this could happen if you edit
HTML page and then start to work with SGML or XML file.  html-mode
(from sgml-mode.el) is used for HTML file and loading of psgml.el
(for sgml-mode or xml-mode) will cause an error.

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* The LDAP support rely on ldapsearch program from OpenLDAP version 2.

It can fail to work with ldapsearch program from OpenLDAP version 1.
Version 1 of OpenLDAP is now deprecated.  If you are still using it,
please upgrade to version 2.  As a temporary workaround, remove
argument "-x" from the variable `ldap-ldapsearch-args'.

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* The `oc-unicode' package doesn't work with Emacs 21.

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This package tries to define more private charsets than there are free
slots now.  If the built-in Unicode/UTF-8 support is insufficient,
e.g. if you need more CJK coverage, use the current Mule-UCS package.
Any files encoded as emacs-mule using oc-unicode won't be read
correctly by Emacs 21.
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* Using epop3.el package causes Emacs to signal an error.

The error message might be something like this:

  "Lisp nesting exceeds max-lisp-eval-depth"

This happens because epop3 redefines the function gethash, which is a
built-in primitive beginning with Emacs 21.1.  We don't have a patch
for epop3 that fixes this, but perhaps a newer version of epop3
corrects that.

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* ps-print commands fail to find prologue files ps-prin*.ps.

This can happen if you use an old version of X-Symbol package: it
defines compatibility functions which trick ps-print into thinking it
runs in XEmacs, and look for the prologue files in a wrong directory.

The solution is to upgrade X-Symbol to a later version.

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* On systems with shared libraries you might encounter run-time errors
from the dynamic linker telling you that it is unable to find some
shared libraries, for instance those for Xaw3d or image support.
These errors mean Emacs has been linked with a library whose shared
library is not in the default search path of the dynamic linker.

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Similar problems could prevent Emacs from building, since the build
process invokes Emacs several times.

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On many systems, it is possible to set LD_LIBRARY_PATH in your
environment to specify additional directories where shared libraries
can be found.

Other systems allow to set LD_RUN_PATH in a similar way, but before
Emacs is linked.  With LD_RUN_PATH set, the linker will include a
specified run-time search path in the executable.

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On some systems, Emacs can crash due to problems with dynamic
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linking.  Specifically, on SGI Irix 6.5, crashes were reported with
backtraces like this:

  (dbx) where
   0 strcmp(0xf49239d, 0x4031184, 0x40302b4, 0x12, 0xf0000000, 0xf4923aa, 0x0, 0x492ddb2) ["/xlv22/ficus-jan23/work/irix/lib/libc/libc_n32_M3_ns/strings/strcmp.s":35, 0xfb7e480]
   1 general_find_symbol(0xf49239d, 0x0, 0x0, 0x0, 0xf0000000, 0xf4923aa, 0x0, 0x492ddb2)
 ["/comp2/mtibuild/v73/workarea/v7.3/rld/rld.c":2140, 0xfb65a98]
   2 resolve_symbol(0xf49239d, 0x4031184, 0x0, 0xfbdd438, 0x0, 0xf4923aa, 0x0, 0x492ddb2)
 ["/comp2/mtibuild/v73/workarea/v7.3/rld/rld.c":1947, 0xfb657e4]
   3 lazy_text_resolve(0xd18, 0x1a3, 0x40302b4, 0x12, 0xf0000000, 0xf4923aa, 0x0, 0x492ddb2)
 ["/comp2/mtibuild/v73/workarea/v7.3/rld/rld.c":997, 0xfb64d44]
   4 _rld_text_resolve(0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
 ["/comp2/mtibuild/v73/workarea/v7.3/rld/rld_bridge.s":175, 0xfb6032c]

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(`rld' is the dynamic linker.)  We don't know yet why this
happens, but setting the environment variable LD_BIND_NOW to 1 (which
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forces the dynamic linker to bind all shared objects early on) seems
to work around the problem.

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Please refer to the documentation of your dynamic linker for details.

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* On Solaris 2.7, building Emacs with WorkShop Compilers 5.0 98/12/15
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C 5.0 failed, apparently with non-default CFLAGS, most probably due to
compiler bugs.  Using Sun Solaris 2.7 Sun WorkShop 6 update 1 C
release was reported to work without problems.  It worked OK on
another system with Solaris 8 using apparently the same 5.0 compiler
and the default CFLAGS.
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* Compiling syntax.c with the OPENSTEP 4.2 compiler gcc 2.7.2.1 fails.

The compiler was reported to crash while compiling syntax.c with the
following message:

   cc: Internal compiler error: program cc1obj got fatal signal 11

To work around this, replace the macros UPDATE_SYNTAX_TABLE_FORWARD,
INC_BOTH, and INC_FROM with functions.  To this end, first define 3
functions, one each for every macro.  Here's an example:

    static int update_syntax_table_forward(int from)
    {
        return(UPDATE_SYNTAX_TABLE_FORWARD(from));
    }/*update_syntax_table_forward*/

Then replace all references to UPDATE_SYNTAX_TABLE_FORWARD in syntax.c
with a call to the function update_syntax_table_forward.

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* Emacs fails to start, complaining about missing fonts.

A typical error message might be something like

  No fonts match `-*-fixed-medium-r-*--6-*-*-*-*-*-iso8859-1'

This happens because some X resource specifies a bad font family for
Emacs to use.  The possible places where this specification might be
are:

  - in your ~/.Xdefaults file

  - client-side X resource file, such as  ~/Emacs or
    /usr/X11R6/lib/app-defaults/Emacs or
    /usr/X11R6/lib/X11/app-defaults/Emacs

One of these files might have bad or malformed specification of a
fontset that Emacs should use.  To fix the problem, you need to find
the problematic line(s) and correct them.

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* Emacs 20 and later fails to load Lisp files at startup.

The typical error message might be like this:

  "Cannot open load file: fontset"

This could happen if you compress the file lisp/subdirs.el.  That file
tells Emacs what are the directories where it should look for Lisp
files.  Emacs cannot work with subdirs.el compressed, since the
Auto-compress mode it needs for this will not be loaded until later,
when your .emacs file is processed.  (The package `fontset.el' is
required to set up fonts used to display text on window systems, and
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it's loaded very early in the startup procedure.)
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Similarly, any other .el file for which there's no corresponding .elc
file could fail to load if it is compressed.

The solution is to uncompress all .el files which don't have a .elc
file.

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Another possible reason for such failures is stale *.elc files
lurking somewhere on your load-path.  The following command will
print any duplicate Lisp files that are present in load-path:

    emacs -q -batch -f list-load-path-shadows

If this command prints any file names, some of these files are stale,
and should be deleted or their directories removed from your
load-path.

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* Emacs prints an error at startup after upgrading from an earlier version.

An example of such an error is:

  x-complement-fontset-spec: "Wrong type argument: stringp, nil" 

This can be another symptom of stale *.elc files in your classpath.
The following command will print any duplicate Lisp files that are
present in load-path:

    emacs -q -batch -f list-load-path-shadows

If this command prints any file names, some of these files are stale,
and should be deleted or their directories removed from your
load-path.

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* Attempting to visit remote files via ange-ftp fails.

If the error message is "ange-ftp-file-modtime: Specified time is not
representable", then this could happen when `lukemftp' is used as the
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ftp client.  This was reported to happen on Debian GNU/Linux, kernel
version 2.4.3, with `lukemftp' 1.5-5, but might happen on other
systems as well.  To avoid this problem, switch to using the standard
ftp client.  On a Debian system, type
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  update-alternatives --config ftp
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and then choose /usr/bin/netkit-ftp.

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* Emacs built on Windows 9x/ME crashes at startup on Windows XP,
or Emacs built on XP crashes at startup on Windows 9x/ME.

There appear to be general problems running programs compiled on
Windows 9x/ME on Windows XP and vice-versa, at least when compilation
is done with MSVC 6.0.  This affects other programs as well as Emacs.
The compatibility options in the program properties on Windows XP may
help in some cases.

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* Antivirus software interacts badly with the MS-Windows version of Emacs.

The usual manifestation of these problems is that subprocesses don't
work or even wedge the entire system.  In particular, "M-x shell RET"
was reported to fail to work.  But other commands also sometimes don't
work when an antivirus package is installed.

The solution is to switch the antivirus software to a less aggressive
mode (e.g., disable the ``auto-protect'' feature), or even uninstall
or disable it entirely.

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* On Windows 95/98/ME, subprocesses do not terminate properly.

This is a limitation of the Operating System, and can cause problems
when shutting down Windows. Ensure that all subprocesses are exited
cleanly before exiting Emacs. For more details, see the FAQ at
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http://www.gnu.org/software/emacs/windows/.
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* Windows 95/98/ME crashes when Emacs invokes non-existent programs.
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When a program you are trying to run is not found on the PATH,
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Windows might respond by crashing or locking up your system.  In
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particular, this has been reported when trying to compile a Java
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program in JDEE when javac.exe is installed, but not on the system
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PATH.
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* Mail sent through Microsoft Exchange in some encodings appears to be
mangled and is not seen correctly in Rmail or Gnus.  We don't know
exactly what happens, but it isn't an Emacs problem in cases we've
seen.

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* After upgrading to a newer version of Emacs, the Meta key stops working.

This was reported to happen on a GNU/Linux system distributed by
Mandrake.  The reason is that the previous version of Emacs was
modified by Mandrake to make the Alt key act as the Meta key, on a
keyboard where the Windows key is the one which produces the Meta
modifier.  A user who started using a newer version of Emacs, which
was not hacked by Mandrake, expected the Alt key to continue to act as
Meta, and was astonished when that didn't happen.

The solution is to find out what key on your keyboard produces the Meta
modifier, and use that key instead.  Try all of the keys to the left
and to the right of the space bar, together with the `x' key, and see
which combination produces "M-x" in the echo area.  You can also use
the `xmodmap' utility to show all the keys which produce a Meta
modifier:

         xmodmap -pk | egrep -i "meta|alt"

A more convenient way of finding out which keys produce a Meta modifier
is to use the `xkbprint' utility, if it's available on your system:

         xkbprint 0:0 /tmp/k.ps

This produces a PostScript file `/tmp/k.ps' with a picture of your
keyboard; printing that file on a PostScript printer will show what
keys can serve as Meta.

The `xkeycaps' also shows a visual representation of the current
keyboard settings.  It also allows to modify them.

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* On OSF/Dec Unix/Tru64/<whatever it is this year> under X locally or
remotely, M-SPC acts as a `compose' key with strange results.  See
keyboard(5).

Changing Alt_L to Meta_L fixes it:
% xmodmap -e 'keysym Alt_L = Meta_L Alt_L'
% xmodmap -e 'keysym Alt_R = Meta_R Alt_R'  

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* Error "conflicting types for `initstate'" compiling with GCC on Irix 6.

Install GCC 2.95 or a newer version, and this problem should go away.
It is possible that this problem results from upgrading the operating
system without reinstalling GCC; so you could also try reinstalling
the same version of GCC, and telling us whether that fixes the problem.

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* Emacs dumps core on Solaris in function IMCheckWindow.

This was reported to happen when Emacs runs with more than one frame,
and one of them is closed, either with "C-x 5 0" or from the window
manager.

This bug was reported to Sun as

    Gtk apps dump core in ximlocal.so.2:IMCheckIMWindow()
    Bug Reports: 4463537

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Installing Solaris 8 patch 108773-12 for Sparc and 108774-12 for x86
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reportedly fixes the bug, which appears to be inside the shared
library xiiimp.so.

Alternatively, you can configure Emacs with `--with-xim=no' to prevent
the core dump, but will loose X input method support, of course.  (You
can use Emacs's own input methods instead, if you install Leim.)

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* On Solaris 7, Emacs gets a segmentation fault when starting up using X.

This results from Sun patch 107058-01 (SunOS 5.7: Patch for
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assembler) if you use GCC version 2.7 or later.
To work around it, either install patch 106950-03 or later,
or uninstall patch 107058-01, or install the GNU Binutils.
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Then recompile Emacs, and it should work.

* With X11R6.4, public-patch-3, Emacs crashes at startup.

Reportedly this patch in X fixes the problem.

    --- xc/lib/X11/imInt.c~	Wed Jun 30 13:31:56 1999
    +++ xc/lib/X11/imInt.c	Thu Jul  1 15:10:27 1999
    @@ -1,4 +1,4 @@
    -/* $TOG: imInt.c /main/5 1998/05/30 21:11:16 kaleb $ */
    +/* $TOG: imInt.c /main/5 1998/05/30 21:11:16 kaleb $  */
     /******************************************************************

		Copyright 1992, 1993, 1994 by FUJITSU LIMITED
    @@ -166,8 +166,8 @@
     _XimMakeImName(lcd)
	 XLCd	   lcd;
     {
    -    char* begin;
    -    char* end;
    +    char* begin = NULL;
    +    char* end = NULL;
	 char* ret;
	 int	i = 0;
	 char* ximmodifier = XIMMODIFIER;
    @@ -182,7 +182,11 @@
	 }
	 ret = Xmalloc(end - begin + 2);
	 if (ret != NULL) {
    -    	(void)strncpy(ret, begin, end - begin + 1);
    +	if (begin != NULL) {
    +      	  (void)strncpy(ret, begin, end - begin + 1);
    +        } else {
    +	  ret[0] = '\0';
    +	}
	    ret[end - begin + 1] = '\0';
	 }
	 return ret;


* Emacs crashes on Irix 6.5 on the SGI R10K, when compiled with GCC.
  
This seems to be fixed in GCC 2.95.

* Emacs crashes in utmpname on Irix 5.3.

This problem is fixed in Patch 3175 for Irix 5.3.
It is also fixed in Irix versions 6.2 and up.

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* The S-C-t key combination doesn't get passed to Emacs on X.

This happens because some X configurations assign the Ctrl-Shift-t
combination the same meaning as the Multi_key.  The offending
definition is in the file `...lib/X11/locale/iso8859-1/Compose'; there
might be other similar combinations which are grabbed by X for similar
purposes.

We think that this can be countermanded with the `xmodmap' utility, if
you want to be able to bind one of these key sequences within Emacs.

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* On Solaris, CTRL-t is ignored by Emacs when you use
the fr.ISO-8859-15 locale (and maybe other related locales).

You can fix this by editing the file:

	/usr/openwin/lib/locale/iso8859-15/Compose
	
Near the bottom there is a line that reads:

	Ctrl<t> <quotedbl> <Y>                  : "\276"        threequarters

that should read:

	Ctrl<T> <quotedbl> <Y>                  : "\276"        threequarters

Note the lower case <t>.  Changing this line should make C-t work.

* Emacs on Digital Unix 4.0 fails to build, giving error message
     Invalid dimension for the charset-ID 160

This is due to a bug or an installation problem in GCC 2.8.0.
Installing a more recent version of GCC fixes the problem.

* Buffers from `with-output-to-temp-buffer' get set up in Help mode.

Changes in Emacs 20.4 to the hooks used by that function cause
problems for some packages, specifically BBDB.  See the function's
documentation for the hooks involved.  BBDB 2.00.06 fixes the problem.

* Under X, C-v and/or other keys don't work.

These may have been intercepted by your window manager.  In
particular, AfterStep 1.6 is reported to steal C-v in its default
configuration.  Various Meta keys are also likely to be taken by the
configuration of the `feel'.  See the WM's documentation for how to
change this.

* When using Exceed, fonts sometimes appear too tall.

When the display is set to an Exceed X-server and fonts are specified
(either explicitly with the -fn option or implicitly with X resources)
then the fonts may appear "too tall".  The actual character sizes are
correct but there is too much vertical spacing between rows,  which 
gives the appearance of "double spacing".  

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To prevent this, turn off the Exceed's "automatic font substitution"
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feature (in the font part of the configuration window).

* Failure in unexec while dumping emacs on Digital Unix 4.0

This problem manifests itself as an error message

    unexec: Bad address, writing data section to ...

The user suspects that this happened because his X libraries
were built for an older system version,

    ./configure --x-includes=/usr/include --x-libraries=/usr/shlib

made the problem go away.

* No visible display on mips-sgi-irix6.2 when compiling with GCC 2.8.1.

This problem went away after installing the latest IRIX patches
as of 8 Dec 1998.

The same problem has been reported on Irix 6.3.

* As of version 20.4, Emacs doesn't work properly if configured for
the Motif toolkit and linked against the free LessTif library.  The
next Emacs release is expected to work with LessTif.

* Emacs gives the error, Couldn't find per display information.

This can result if the X server runs out of memory because Emacs uses
a large number of fonts.  On systems where this happens, C-h h is
likely to cause it.

We do not know of a way to prevent the problem.

* Emacs makes HPUX 11.0 crash.

This is a bug in HPUX; HPUX patch PHKL_16260 is said to fix it.

* Emacs crashes during dumping on the HPPA machine (HPUX 10.20).

This seems to be due to a GCC bug; it is fixed in GCC 2.8.1.

* The Hyperbole package causes *Help* buffers not to be displayed in
Help mode due to setting `temp-buffer-show-hook' rather than using
`add-hook'.  Using `(add-hook 'temp-buffer-show-hook
'help-mode-maybe)' after loading Hyperbole should fix this.

* Versions of the PSGML package earlier than 1.0.3 (stable) or 1.1.2
(alpha) fail to parse DTD files correctly in Emacs 20.3 and later.
Here is a patch for psgml-parse.el from PSGML 1.0.1 and, probably,
earlier versions.

--- psgml-parse.el	1998/08/21 19:18:18	1.1
+++ psgml-parse.el	1998/08/21 19:20:00
@@ -2383,7 +2383,7 @@ (defun sgml-push-to-entity (entity &opti
       (setq sgml-buffer-parse-state nil))
     (cond
      ((stringp entity)			; a file name
-      (save-excursion (insert-file-contents entity))
+      (insert-file-contents entity)
       (setq default-directory (file-name-directory entity)))
      ((consp (sgml-entity-text entity)) ; external id?
       (let* ((extid (sgml-entity-text entity))

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* Emacs 21 freezes when visiting a TeX file with AUC TeX installed.

Emacs 21 needs version 10 or later of AUC TeX; upgrading should solve
these problems.

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* No colors in AUC TeX with Emacs 21.

Upgrade to AUC TeX version 10 or later, and make sure it is
byte-compiled with Emacs 21.

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* Running TeX from AUC TeX package with Emacs 20.3 gives a Lisp error
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about a read-only tex output buffer.

This problem appeared for AUC TeX version 9.9j and some earlier
versions.  Here is a patch for the file tex-buf.el in the AUC TeX
package.

diff -c auctex/tex-buf.el~ auctex/tex-buf.el
*** auctex/tex-buf.el~	Wed Jul 29 18:35:32 1998
--- auctex/tex-buf.el	Sat Sep  5 15:20:38 1998
***************
*** 545,551 ****
  	(dir (TeX-master-directory)))
      (TeX-process-check file)		; Check that no process is running
      (setq TeX-command-buffer (current-buffer))
!     (with-output-to-temp-buffer buffer)
      (set-buffer buffer)
      (if dir (cd dir))
      (insert "Running `" name "' on `" file "' with ``" command "''\n")
- --- 545,552 ----
  	(dir (TeX-master-directory)))
      (TeX-process-check file)		; Check that no process is running
      (setq TeX-command-buffer (current-buffer))
!     (let (temp-buffer-show-function temp-buffer-show-hook)
!       (with-output-to-temp-buffer buffer))
      (set-buffer buffer)
      (if dir (cd dir))
      (insert "Running `" name "' on `" file "' with ``" command "''\n")

* On Irix 6.3, substituting environment variables in file names
in the minibuffer gives peculiar error messages such as

   Substituting nonexistent environment variable ""

This is not an Emacs bug; it is caused by something in SGI patch
003082 August 11, 1998.

* After a while, Emacs slips into unibyte mode.

The VM mail package, which is not part of Emacs, sometimes does
  (standard-display-european t)
That should be changed to 
  (standard-display-european 1 t)

* Installing Emacs gets an error running `install-info'.

You need to install a recent version of Texinfo; that package
supplies the `install-info' command.

* Emacs does not recognize the AltGr key, on HPUX.

To fix this, set up a file ~/.dt/sessions/sessionetc with executable
rights, containing this text:

--------------------------------
xmodmap 2> /dev/null - << EOF
keysym Alt_L = Meta_L
keysym Alt_R = Meta_R
EOF

xmodmap - << EOF
clear mod1
keysym Mode_switch = NoSymbol
add mod1 = Meta_L
keysym Meta_R = Mode_switch
add mod2 = Mode_switch
EOF
--------------------------------

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* Emacs hangs on KDE when a large portion of text is killed.

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This is caused by a bug in the KDE applet `klipper' which periodically
requests the X clipboard contents from applications.  Early versions
of klipper don't implement the ICCM protocol for large selections,
which leads to Emacs being flooded with selection requests.  After a
while, Emacs will print a message:
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  Timed out waiting for property-notify event

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A workaround is to not use `klipper'.
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* Emacs compiled with DJGPP for MS-DOS/MS-Windows cannot access files
in the directory with the special name `dev' under the root of any
drive, e.g. `c:/dev'.

This is an unfortunate side-effect of the support for Unix-style
device names such as /dev/null in the DJGPP runtime library.  A
work-around is to rename the problem directory to another name.

* M-SPC seems to be ignored as input.

See if your X server is set up to use this as a command
for character composition.

* Emacs startup on GNU/Linux systems (and possibly other systems) is slow.

This can happen if the system is misconfigured and Emacs can't get the
full qualified domain name, FQDN.  You should have your FQDN in the
/etc/hosts file, something like this:

127.0.0.1	localhost
129.187.137.82	nuc04.t30.physik.tu-muenchen.de	nuc04

The way to set this up may vary on non-GNU systems.

* Garbled display on non-X terminals when Emacs runs on Digital Unix 4.0.

So far it appears that running `tset' triggers this problem (when TERM
is vt100, at least).  If you do not run `tset', then Emacs displays
properly.  If someone can tell us precisely which effect of running
`tset' actually causes the problem, we may be able to implement a fix
in Emacs.

* When you run Ispell from Emacs, it reports a "misalignment" error.

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This can happen if you compiled the Ispell program to use ASCII
characters only and then try to use it from Emacs with non-ASCII
characters, like Latin-1.  The solution is to recompile Ispell with
support for 8-bit characters.
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To see whether your Ispell program supports 8-bit characters, type
this at your shell's prompt:

     ispell -vv

and look in the output for the string "NO8BIT".  If Ispell says
"!NO8BIT (8BIT)", your speller supports 8-bit characters; otherwise it
does not.

To rebuild Ispell with 8-bit character support, edit the local.h file
in the Ispell distribution and make sure it does _not_ define NO8BIT.
Then rebuild the speller.

Another possible cause for "misalignment" error messages is that the
version of Ispell installed on your machine is old.  Upgrade.

Yet another possibility is that you are trying to spell-check a word
in a language that doesn't fit the dictionary you choose for use by
Ispell.  (Ispell can only spell-check one language at a time, because
it uses a single dictionary.)  Make sure that the text you are
spelling and the dictionary used by Ispell conform to each other.
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* On Linux-based GNU systems using libc versions 5.4.19 through
5.4.22, Emacs crashes at startup with a segmentation fault.

This problem happens if libc defines the symbol __malloc_initialized.
One known solution is to upgrade to a newer libc version.  5.4.33 is
known to work.

* On Windows, you cannot use the right-hand ALT key and the left-hand
CTRL key together to type a Control-Meta character.

This is a consequence of a misfeature beyond Emacs's control.

Under Windows, the AltGr key on international keyboards generates key
events with the modifiers Right-Alt and Left-Ctrl.  Since Emacs cannot
distinguish AltGr from an explicit Right-Alt and Left-Ctrl
combination, whenever it sees Right-Alt and Left-Ctrl it assumes that
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AltGr has been pressed.  The variable `w32-recognize-altgr' can be set
to nil to tell Emacs that AltGr is really Ctrl and Alt.
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* Emacs crashes when using the Exceed 6.0 X server

If you are using Exceed 6.1, upgrade to a later version.  This was
reported to prevent the crashes.

* Under some Windows X-servers, Emacs' display is incorrect
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The symptoms are that Emacs does not completely erase blank areas of the
screen during scrolling or some other screen operations (e.g., selective
display or when killing a region).  M-x recenter will cause the screen
to be completely redisplayed and the "extra" characters will disappear.

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This is known to occur under Exceed 6, and possibly earlier versions
as well; it is reportedly solved in version 6.2.0.16 and later.  The
problem lies in the X-server settings.
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There are reports that you can solve the problem with Exceed by
running `Xconfig' from within NT, choosing "X selection", then
un-checking the boxes "auto-copy X selection" and "auto-paste to X
selection".

Of this does not work, please inform bug-gnu-emacs@gnu.org.  Then
please call support for your X-server and see if you can get a fix.
If you do, please send it to bug-gnu-emacs@gnu.org so we can list it
here.

* On Solaris 2, Emacs dumps core when built with Motif.

The Solaris Motif libraries are buggy, at least up through Solaris 2.5.1.
Install the current Motif runtime library patch appropriate for your host.
(Make sure the patch is current; some older patch versions still have the bug.)
You should install the other patches recommended by Sun for your host, too.
You can obtain Sun patches from ftp://sunsolve.sun.com/pub/patches/;
look for files with names ending in `.PatchReport' to see which patches
are currently recommended for your host.

On Solaris 2.6, Emacs is said to work with Motif when Solaris patch
105284-12 is installed, but fail when 105284-15 is installed.
105284-18 might fix it again.

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* On Solaris 2.6 and 7, the Compose key does not work.

This is a bug in Motif in Solaris.  Supposedly it has been fixed for
the next major release of Solaris.  However, if someone with Sun
support complains to Sun about the bug, they may release a patch.
If you do this, mention Sun bug #4188711.
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One workaround is to use a locale that allows non-ASCII characters.
For example, before invoking emacs, set the LC_ALL environment
variable to "en_US" (American English).  The directory /usr/lib/locale
lists the supported locales; any locale other than "C" or "POSIX"
should do.

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pen@lysator.liu.se says (Feb 1998) that the Compose key does work
if you link with the MIT X11 libraries instead of the Solaris X11
libraries.
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* Frames may cover dialogs they created when using CDE.

This can happen if you have "Allow Primary Windows On Top" enabled which
seems to be the default in the Common Desktop Environment.
To change, go in to "Desktop Controls" -> "Window Style Manager"
and uncheck "Allow Primary Windows On Top".

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* Emacs does not know your host's fully-qualified domain name.

You need to configure your machine with a fully qualified domain name,
either in /etc/hosts, /etc/hostname, the NIS, or wherever your system
calls for specifying this.

If you cannot fix the configuration, you can set the Lisp variable
mail-host-address to the value you want.

* Error 12 (virtual memory exceeded) when dumping Emacs, on UnixWare 2.1

Paul Abrahams (abrahams@acm.org) reports that with the installed
virtual memory settings for UnixWare 2.1.2, an Error 12 occurs during
the "make" that builds Emacs, when running temacs to dump emacs.  That
error indicates that the per-process virtual memory limit has been
exceeded.  The default limit is probably 32MB.  Raising the virtual
memory limit to 40MB should make it possible to finish building Emacs.

You can do this with the command `ulimit' (sh) or `limit' (csh).
But you have to be root to do it.

According to Martin Sohnius, you can also retune this in the kernel:

    # /etc/conf/bin/idtune SDATLIM 33554432         ## soft data size limit
    # /etc/conf/bin/idtune HDATLIM 33554432         ## hard "
    # /etc/conf/bin/idtune SVMMSIZE unlimited       ## soft process size limit
    # /etc/conf/bin/idtune HVMMSIZE unlimited       ## hard "
    # /etc/conf/bin/idbuild -B

(He recommends you not change the stack limit, though.)
These changes take effect when you reboot.

* Redisplay using X11 is much slower than previous Emacs versions.

We've noticed that certain X servers draw the text much slower when
scroll bars are on the left.  We don't know why this happens.  If this
happens to you, you can work around it by putting the scroll bars
on the right (as they were in Emacs 19).

Here's how to do this:

  (set-scroll-bar-mode 'right)

If you're not sure whether (or how much) this problem affects you,
try that and see how much difference it makes.  To set things back
to normal, do

  (set-scroll-bar-mode 'left)

* Under X11, some characters appear as hollow boxes.

Each X11 font covers just a fraction of the characters that Emacs
supports.  To display the whole range of Emacs characters requires
many different fonts, collected into a fontset.

If some of the fonts called for in your fontset do not exist on your X
server, then the characters that have no font appear as hollow boxes.
You can remedy the problem by installing additional fonts.

The intlfonts distribution includes a full spectrum of fonts that can
display all the characters Emacs supports.

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Another cause of this for specific characters is fonts which have a
missing glyph and no default character.  This is known ot occur for
character number 160 (no-break space) in some fonts, such as Lucida
but Emacs sets the display table for the unibyte and Latin-1 version
of this character to display a space.

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* Under X11, some characters appear improperly aligned in their lines.

You may have bad X11 fonts; try installing the intlfonts distribution.

* Certain fonts make each line take one pixel more than it "should".

This is because these fonts contain characters a little taller
than the font's nominal height.  Emacs needs to make sure that
lines do not overlap.

* You request inverse video, and the first Emacs frame is in inverse
video, but later frames are not in inverse video.

This can happen if you have an old version of the custom library in
your search path for Lisp packages.  Use M-x list-load-path-shadows to
check whether this is true.  If it is, delete the old custom library.

* In FreeBSD 2.1.5, useless symbolic links remain in /tmp or other
directories that have the +t bit.

This is because of a kernel bug in FreeBSD 2.1.5 (fixed in 2.2).
Emacs uses symbolic links to implement file locks.  In a directory
with +t bit, the directory owner becomes the owner of the symbolic
link, so that it cannot be removed by anyone else.

If you don't like those useless links, you can let Emacs not to using
file lock by adding #undef CLASH_DETECTION to config.h.

* When using M-x dbx with the SparcWorks debugger, the `up' and `down'
commands do not move the arrow in Emacs.

You can fix this by adding the following line to `~/.dbxinit':

 dbxenv output_short_file_name off

* Emacs says it has saved a file, but the file does not actually
appear on disk.

This can happen on certain systems when you are using NFS, if the
remote disk is full.  It is due to a bug in NFS (or certain NFS
implementations), and there is apparently nothing Emacs can do to
detect the problem.  Emacs checks the failure codes of all the system
calls involved in writing a file, including `close'; but in the case
where the problem occurs, none of those system calls fails.

* "Compose Character" key does strange things when used as a Meta key.

If you define one key to serve as both Meta and Compose Character, you
will get strange results.  In previous Emacs versions, this "worked"
in that the key acted as Meta--that's because the older Emacs versions
did not try to support Compose Character.  Now Emacs tries to do
character composition in the standard X way.  This means that you
must pick one meaning or the other for any given key.

You can use both functions (Meta, and Compose Character) if you assign
them to two different keys.

* Emacs gets a segmentation fault at startup, on AIX4.2.

If you are using IBM's xlc compiler, compile emacs.c
without optimization; that should avoid the problem.

* movemail compiled with POP support can't connect to the POP server.

Make sure that the `pop' entry in /etc/services, or in the services
NIS map if your machine uses NIS, has the same port number as the
entry on the POP server.  A common error is for the POP server to be
listening on port 110, the assigned port for the POP3 protocol, while
the client is trying to connect on port 109, the assigned port for the
old POP protocol.

* Emacs crashes in x-popup-dialog.

This can happen if the dialog widget cannot find the font it wants to
use.  You can work around the problem by specifying another font with
an X resource--for example, `Emacs.dialog*.font: 9x15' (or any font that
happens to exist on your X server).

* Emacs crashes when you use Bibtex mode.

This happens if your system puts a small limit on stack size.  You can
prevent the problem by using a suitable shell command (often `ulimit')
to raise the stack size limit before you run Emacs.

Patches to raise the stack size limit automatically in `main'
(src/emacs.c) on various systems would be greatly appreciated.

* Emacs crashes with SIGBUS or SIGSEGV on HPUX 9 after you delete a frame.

We think this is due to a bug in the X libraries provided by HP.  With
the alternative X libraries in /usr/contrib/mitX11R5/lib, the problem
does not happen.

* Emacs crashes with SIGBUS or SIGSEGV on Solaris after you delete a frame.

We suspect that this is a similar bug in the X libraries provided by
Sun.  There is a report that one of these patches fixes the bug and
makes the problem stop:

105216-01 105393-01 105518-01 105621-01 105665-01 105615-02 105216-02
105667-01 105401-08 105615-03 105621-02 105686-02 105736-01 105755-03
106033-01 105379-01 105786-01 105181-04 105379-03 105786-04 105845-01
105284-05 105669-02 105837-01 105837-02 105558-01 106125-02 105407-01

Another person using a newer system (kernel patch level Generic_105181-06)
suspects that the bug was fixed by one of these more recent patches:

106040-07  SunOS 5.6: X Input & Output Method patch
106222-01  OpenWindows 3.6: filemgr (ff.core) fixes
105284-12  Motif 1.2.7: sparc Runtime library patch

* Problems running Perl under Emacs on Windows NT/95.

`perl -de 0' just hangs when executed in an Emacs subshell.
The fault lies with Perl (indirectly with Windows NT/95).

The problem is that the Perl debugger explicitly opens a connection to
"CON", which is the DOS/NT equivalent of "/dev/tty", for interacting
with the user.

On Unix, this is okay, because Emacs (or the shell?) creates a
pseudo-tty so that /dev/tty is really the pipe Emacs is using to
communicate with the subprocess.

On NT, this fails because CON always refers to the handle for the
relevant console (approximately equivalent to a tty), and cannot be
redirected to refer to the pipe Emacs assigned to the subprocess as
stdin.

A workaround is to modify perldb.pl to use STDIN/STDOUT instead of CON.

For Perl 4:

    *** PERL/LIB/PERLDB.PL.orig	Wed May 26 08:24:18 1993
    --- PERL/LIB/PERLDB.PL	Mon Jul 01 15:28:16 1996
    ***************
    *** 68,74 ****
	  $rcfile=".perldb";
      }
      else {
    !     $console = "con";
	  $rcfile="perldb.ini";
      }

    --- 68,74 ----
	  $rcfile=".perldb";
      }
      else {
    !     $console = "";
	  $rcfile="perldb.ini";
      }


    For Perl 5:
    *** perl/5.001/lib/perl5db.pl.orig	Sun Jun 04 21:13:40 1995
    --- perl/5.001/lib/perl5db.pl	Mon Jul 01 17:00:08 1996
    ***************
    *** 22,28 ****
	  $rcfile=".perldb";
      }
      elsif (-e "con") {
    !     $console = "con";
	  $rcfile="perldb.ini";
      }
      else {
    --- 22,28 ----
	  $rcfile=".perldb";
      }
      elsif (-e "con") {
    !     $console = "";
	  $rcfile="perldb.ini";
      }
      else {

* Problems on MS-DOG if DJGPP v2.0 is used to compile Emacs:

There are two DJGPP library bugs which cause problems:

  * Running `shell-command' (or `compile', or `grep') you get
    `Searching for program: permission denied (EACCES), c:/command.com';
  * After you shell to DOS, Ctrl-Break kills Emacs.

To work around these bugs, you can use two files in the msdos
subdirectory: `is_exec.c' and `sigaction.c'.  Compile them and link
them into the Emacs executable `temacs'; then they will replace the
incorrect library functions.

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* When compiling with DJGPP on Windows NT, "config msdos" fails.

If the error message is "VDM has been already loaded", this is because
Windows has a program called `redir.exe' that is incompatible with a
program by the same name supplied with DJGPP, which is used by
config.bat.  To resolve this, move the DJGPP's `bin' subdirectory to
the front of your PATH environment variable.

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* When compiling with DJGPP on Windows 95, Make fails for some targets
like make-docfile.

This can happen if long file name support (the setting of environment
variable LFN) when Emacs distribution was unpacked and during
compilation are not the same.  See the MSDOG section of INSTALL for
the explanation of how to avoid this problem.

* Emacs compiled for MSDOS cannot find some Lisp files, or other
run-time support files, when long filename support is enabled.
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Usually, this problem will manifest itself when Emacs exits
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immediately after flashing the startup screen, because it cannot find
the Lisp files it needs to load at startup.  Redirect Emacs stdout
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and stderr to a file to see the error message printed by Emacs.

Another manifestation of this problem is that Emacs is unable to load
the support for editing program sources in languages such as C and
Lisp.
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This can happen if the Emacs distribution was unzipped without LFN
support, thus causing long filenames to be truncated to the first 6
characters and a numeric tail that Windows 95 normally attaches to it.
You should unzip the files again with a utility that supports long
filenames (such as djtar from DJGPP or InfoZip's UnZip program
compiled with DJGPP v2).  The MSDOG section of the file INSTALL
explains this issue in more detail.

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Another possible reason for such failures is that Emacs compiled for
MSDOS is used on Windows NT, where long file names are not supported
by this version of Emacs, but the distribution was unpacked by an
unzip program that preserved the long file names instead of truncating
them to DOS 8+3 limits.  To be useful on NT, the MSDOS port of Emacs
must be unzipped by a DOS utility, so that long file names are
properly truncated.

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* Emacs compiled with DJGPP complains at startup:

  "Wrong type of argument: internal-facep, msdos-menu-active-face"

This can happen if you define an environment variable `TERM'.  Emacs
on MSDOS uses an internal terminal emulator which is disabled if the
value of `TERM' is anything but the string "internal".  Emacs then
works as if its terminal were a dumb glass teletype that doesn't
support faces.  To work around this, arrange for `TERM' to be
undefined when Emacs runs.  The best way to do that is to add an
[emacs] section to the DJGPP.ENV file which defines an empty value for
`TERM'; this way, only Emacs gets the empty value, while the rest of
your system works as before.

* On Windows 95, Alt-f6 does not get through to Emacs.

This character seems to be trapped by the kernel in Windows 95.
You can enter M-f6 by typing ESC f6.

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* Typing Alt-Shift has strange effects on Windows.
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This combination of keys is a command to change keyboard layout.  If
you proceed to type another non-modifier key before you let go of Alt
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and Shift, the Alt and Shift act as modifiers in the usual way.  A
more permanent work around is to change it to another key combination,
or disable it in the keyboard control panel.
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* `tparam' reported as a multiply-defined symbol when linking with ncurses.

This problem results from an incompatible change in ncurses, in
version 1.9.9e approximately.  This version is unable to provide a
definition of tparm without also defining tparam.  This is also
incompatible with Terminfo; as a result, the Emacs Terminfo support
does not work with this version of ncurses.

The fix is to install a newer version of ncurses, such as version 4.2.

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* Emacs does not start complaining that it cannot open termcap database file.

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If your system uses Terminfo rather than termcap (most modern systems
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do), this could happen if you have an old version of ncurses
installed, or if the newer version is not visible to the Emacs
configure script (i.e. it cannot be found along the usual path the
linker looks for libraries).

The solution is to install a newer version of ncurses, and make sure
the linker can find it.

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