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dnl  Autoconf script for GNU Emacs
dnl To rebuild the `configure' script from this, execute the command
dnl 	autoconf
dnl in the directory containing this script.
dnl If you changed any AC_DEFINES, also run autoheader.
dnl
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dnl Copyright (C) 1994-1996, 1999-2012 Free Software Foundation, Inc.
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dnl
dnl  This file is part of GNU Emacs.
dnl
dnl  GNU Emacs is free software: you can redistribute it and/or modify
dnl  it under the terms of the GNU General Public License as published by
dnl  the Free Software Foundation, either version 3 of the License, or
dnl  (at your option) any later version.
dnl
dnl  GNU Emacs is distributed in the hope that it will be useful,
dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl  GNU General Public License for more details.
dnl
dnl  You should have received a copy of the GNU General Public License
dnl  along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

AC_PREREQ(2.65)
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AC_INIT(emacs, 24.2.50)
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AC_CONFIG_HEADER(src/config.h:src/config.in)
AC_CONFIG_SRCDIR(src/lisp.h)
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AC_CONFIG_AUX_DIR(build-aux)
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dnl Fairly arbitrary, older versions might work too.
AM_INIT_AUTOMAKE(1.11)
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dnl Support for --program-prefix, --program-suffix and
dnl --program-transform-name options
AC_ARG_PROGRAM

dnl It is important that variables on the RHS not be expanded here,
dnl hence the single quotes.  This is per the GNU coding standards, see
dnl (autoconf) Installation Directory Variables
dnl See also epaths.h below.
lispdir='${datadir}/emacs/${version}/lisp'
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leimdir='${datadir}/emacs/${version}/leim'
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standardlisppath='${lispdir}:${leimdir}'
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locallisppath='${datadir}/emacs/${version}/site-lisp:'\
'${datadir}/emacs/site-lisp'
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lisppath='${locallisppath}:${standardlisppath}'
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etcdir='${datadir}/emacs/${version}/etc'
archlibdir='${libexecdir}/emacs/${version}/${configuration}'
docdir='${datadir}/emacs/${version}/etc'
gamedir='${localstatedir}/games/emacs'

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dnl Special option to disable the most of other options.
AC_ARG_WITH(all,
[AS_HELP_STRING([--without-all],
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		[omit almost all features and build
		small executable with minimal dependencies])],
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  with_features=$withval,
  with_features=yes)
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dnl OPTION_DEFAULT_OFF(NAME, HELP-STRING)
dnl Create a new --with option that defaults to being disabled.
dnl NAME is the base name of the option.  The shell variable with_NAME
dnl   will be set to either the user's value (if the option is
dnl   specified; 'yes' for a plain --with-NAME) or to 'no' (if the
dnl   option is not specified).  Note that the shell variable name is
dnl   constructed as autoconf does, by replacing non-alphanumeric
dnl   characters with "_".
dnl HELP-STRING is the help text for the option.
AC_DEFUN([OPTION_DEFAULT_OFF], [dnl
  AC_ARG_WITH([$1],[AS_HELP_STRING([--with-$1],[$2])],[],[dnl
    m4_bpatsubst([with_$1], [[^0-9a-z]], [_])=no])dnl
])dnl

dnl OPTION_DEFAULT_ON(NAME, HELP-STRING)
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dnl Create a new --with option that defaults to $enable_features.
dnl NAME is the base name of the option.  The shell variable with_NAME
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dnl   will be set either to 'no' (for a plain --without-NAME) or to
dnl   'yes' (if the option is not specified).  Note that the shell
dnl   variable name is constructed as autoconf does, by replacing
dnl   non-alphanumeric characters with "_".
dnl HELP-STRING is the help text for the option.
AC_DEFUN([OPTION_DEFAULT_ON], [dnl
  AC_ARG_WITH([$1],[AS_HELP_STRING([--without-$1],[$2])],[],[dnl
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   m4_bpatsubst([with_$1], [[^0-9a-z]], [_])=$with_features])dnl
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])dnl

OPTION_DEFAULT_ON([pop],[don't support POP mail retrieval with movemail])
if test "$with_pop" = yes; then
   AC_DEFINE(MAIL_USE_POP)
fi
AH_TEMPLATE(MAIL_USE_POP, [Define to support POP mail retrieval.])dnl

OPTION_DEFAULT_OFF([kerberos],[support Kerberos-authenticated POP])
if test "$with_kerberos" != no; then
   AC_DEFINE(KERBEROS)
fi
AH_TEMPLATE(KERBEROS,
	    [Define to support Kerberos-authenticated POP mail retrieval.])dnl

OPTION_DEFAULT_OFF([kerberos5],[support Kerberos version 5 authenticated POP])
if test "${with_kerberos5}" != no; then
  if test "${with_kerberos}" = no; then
    with_kerberos=yes
    AC_DEFINE(KERBEROS)
  fi
  AC_DEFINE(KERBEROS5, 1, [Define to use Kerberos 5 instead of Kerberos 4.])
fi

OPTION_DEFAULT_OFF([hesiod],[support Hesiod to get the POP server host])
dnl FIXME hesiod support may not be present, so it seems like an error
dnl to define, or at least use, this unconditionally.
if test "$with_hesiod" != no; then
  AC_DEFINE(HESIOD, 1, [Define to support using a Hesiod database to find the POP server.])
fi

OPTION_DEFAULT_OFF([mmdf],[support MMDF mailboxes])
if test "$with_mmdf" != no; then
   AC_DEFINE(MAIL_USE_MMDF, 1, [Define to support MMDF mailboxes in movemail.])
fi

OPTION_DEFAULT_OFF([mail-unlink],[unlink, rather than empty, mail spool after reading])
if test "$with_mail_unlink" != no; then
   AC_DEFINE(MAIL_UNLINK_SPOOL, 1, [Define to unlink, rather than empty, mail spool after reading.])
fi

AC_ARG_WITH([mailhost],[AS_HELP_STRING([--with-mailhost=HOSTNAME],
    [string giving default POP mail host])],
    AC_DEFINE_UNQUOTED(MAILHOST, ["$withval"], [String giving fallback POP mail host.]))

OPTION_DEFAULT_ON([sound],[don't compile with sound support])

OPTION_DEFAULT_ON([sync-input],[process async input synchronously])
if test "$with_sync_input" = yes; then
   AC_DEFINE(SYNC_INPUT, 1, [Process async input synchronously.])
fi

dnl FIXME currently it is not the last.
dnl This should be the last --with option, because --with-x is
dnl added later on when we find the path of X, and it's best to
dnl keep them together visually.
AC_ARG_WITH([x-toolkit],[AS_HELP_STRING([--with-x-toolkit=KIT],
 [use an X toolkit (KIT one of: yes or gtk, gtk3, lucid or athena, motif, no)])],
[	  case "${withval}" in
	    y | ye | yes )	val=gtk ;;
	    n | no )		val=no  ;;
	    l | lu | luc | luci | lucid )	val=lucid ;;
	    a | at | ath | athe | athen | athena )	val=athena ;;
	    m | mo | mot | moti | motif )	val=motif ;;
	    g | gt | gtk  )	val=gtk ;;
	    gtk3  )	val=gtk3 ;;
	    * )
AC_MSG_ERROR([`--with-x-toolkit=$withval' is invalid;
this option's value should be `yes', `no', `lucid', `athena', `motif', `gtk' or
`gtk3'.  `yes' and `gtk' are synonyms. `athena' and `lucid' are synonyms.])
	    ;;
	  esac
	  with_x_toolkit=$val
])

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OPTION_DEFAULT_OFF([wide-int], [prefer wide Emacs integers (typically 62-bit)])
if test "$with_wide_int" = yes; then
  AC_DEFINE([WIDE_EMACS_INT], 1, [Use long long for EMACS_INT if available.])
fi

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dnl _ON results in a '--without' option in the --help output, so
dnl the help text should refer to "don't compile", etc.
OPTION_DEFAULT_ON([xpm],[don't compile with XPM image support])
OPTION_DEFAULT_ON([jpeg],[don't compile with JPEG image support])
OPTION_DEFAULT_ON([tiff],[don't compile with TIFF image support])
OPTION_DEFAULT_ON([gif],[don't compile with GIF image support])
OPTION_DEFAULT_ON([png],[don't compile with PNG image support])
OPTION_DEFAULT_ON([rsvg],[don't compile with SVG image support])
OPTION_DEFAULT_ON([xml2],[don't compile with XML parsing support])
OPTION_DEFAULT_ON([imagemagick],[don't compile with ImageMagick image support])

OPTION_DEFAULT_ON([xft],[don't use XFT for anti aliased fonts])
OPTION_DEFAULT_ON([libotf],[don't use libotf for OpenType font support])
OPTION_DEFAULT_ON([m17n-flt],[don't use m17n-flt for text shaping])

OPTION_DEFAULT_ON([toolkit-scroll-bars],[don't use Motif or Xaw3d scroll bars])
OPTION_DEFAULT_ON([xaw3d],[don't use Xaw3d])
OPTION_DEFAULT_ON([xim],[don't use X11 XIM])
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OPTION_DEFAULT_OFF([ns],[use NeXTstep (Cocoa or GNUstep) windowing system])
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OPTION_DEFAULT_ON([gpm],[don't use -lgpm for mouse support on a GNU/Linux console])
OPTION_DEFAULT_ON([dbus],[don't compile with D-Bus support])
OPTION_DEFAULT_ON([gconf],[don't compile with GConf support])
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OPTION_DEFAULT_ON([gsettings],[don't compile with GSettings support])
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OPTION_DEFAULT_ON([selinux],[don't compile with SELinux support])
OPTION_DEFAULT_ON([gnutls],[don't use -lgnutls for SSL/TLS support])

## For the times when you want to build Emacs but don't have
## a suitable makeinfo, and can live without the manuals.
dnl http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg01844.html
OPTION_DEFAULT_ON([makeinfo],[don't require makeinfo for building manuals])

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## Makefile.in needs the cache file name.
AC_SUBST(cache_file)

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## This is an option because I do not know if all info/man support
## compressed files, nor how to test if they do so.
OPTION_DEFAULT_ON([compress-info],[don't compress the installed Info pages])
if test $with_compress_info = yes; then
   GZIP_INFO=yes
else
   GZIP_INFO=
fi
AC_SUBST(GZIP_INFO)

AC_ARG_WITH([pkg-config-prog],dnl
[AS_HELP_STRING([--with-pkg-config-prog=PATH],
                  [path to pkg-config for finding GTK and librsvg])])
if test "X${with_pkg_config_prog}" != X; then
   if test "${with_pkg_config_prog}" != yes; then
      PKG_CONFIG="${with_pkg_config_prog}"
   fi
fi

CRT_DIR=
AC_ARG_WITH([crt-dir],dnl
[AS_HELP_STRING([--with-crt-dir=DIR],[directory containing crtn.o etc.
The default is /usr/lib, or /usr/lib64 on some platforms.])])
CRT_DIR="${with_crt_dir}"

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AC_ARG_WITH(gameuser,dnl
[AS_HELP_STRING([--with-gameuser=USER],[user for shared game score files])])
test "X${with_gameuser}" != X && test "${with_gameuser}" != yes \
  && gameuser="${with_gameuser}"
test "X$gameuser" = X && gameuser=games

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AC_ARG_WITH([gnustep-conf],dnl
[AS_HELP_STRING([--with-gnustep-conf=PATH],[path to GNUstep.conf; default $GNUSTEP_CONFIG_FILE, or /etc/GNUstep/GNUstep.conf])])
test "X${with_gnustep_conf}" != X && test "${with_gnustep_conf}" != yes && \
  GNUSTEP_CONFIG_FILE="${with_gnustep_conf}"
test "X$GNUSTEP_CONFIG_FILE" = "X" && \
     GNUSTEP_CONFIG_FILE=/etc/GNUstep/GNUstep.conf

AC_ARG_ENABLE(ns-self-contained,
[AS_HELP_STRING([--disable-ns-self-contained],
                [disable self contained build under NeXTstep])],
   EN_NS_SELF_CONTAINED=$enableval,
   EN_NS_SELF_CONTAINED=yes)

AC_ARG_ENABLE(locallisppath,
[AS_HELP_STRING([--enable-locallisppath=PATH],
                [directories Emacs should search for lisp files specific
		 to this site])],
if test "${enableval}" = "no"; then
  locallisppath=
elif test "${enableval}" != "yes"; then
  locallisppath=${enableval}
fi)

AC_ARG_ENABLE(checking,
[AS_HELP_STRING([--enable-checking@<:@=LIST@:>@],
		[enable expensive run-time checks.  With LIST,
		 enable only specific categories of checks.
		 Categories are: all,yes,no.
		 Flags are: stringbytes, stringoverrun, stringfreelist,
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		 xmallocoverrun, conslist, glyphs])],
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[ac_checking_flags="${enableval}"],[])
IFS="${IFS= 	}"; ac_save_IFS="$IFS"; IFS="$IFS,"
for check in $ac_checking_flags
do
	case $check in
	# these set all the flags to specific states
	yes)		ac_enable_checking=1 ;;
	no)		ac_enable_checking= ;
			ac_gc_check_stringbytes= ;
	                ac_gc_check_string_overrun= ;
	                ac_gc_check_string_free_list= ;
	                ac_xmalloc_overrun= ;
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	                ac_gc_check_cons_list= ;
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			ac_glyphs_debug= ;;
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	all)		ac_enable_checking=1 ;
			ac_gc_check_stringbytes=1 ;
	                ac_gc_check_string_overrun=1 ;
	                ac_gc_check_string_free_list=1 ;
	                ac_xmalloc_overrun=1 ;
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	                ac_gc_check_cons_list=1 ;
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			ac_glyphs_debug=1 ;;
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	# these enable particular checks
	stringbytes) 	ac_gc_check_stringbytes=1 ;;
	stringoverrun) 	ac_gc_check_string_overrun=1 ;;
	stringfreelist) ac_gc_check_string_free_list=1 ;;
	xmallocoverrun)	ac_xmalloc_overrun=1 ;;
	conslist)	ac_gc_check_cons_list=1 ;;
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	glyphs)		ac_glyphs_debug=1 ;;
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	*)	AC_MSG_ERROR(unknown check category $check) ;;
	esac
done
IFS="$ac_save_IFS"

if test x$ac_enable_checking != x ; then
  AC_DEFINE(ENABLE_CHECKING, 1,
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[Define to 1 if expensive run-time data type and consistency checks are enabled.])
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fi
if test x$ac_gc_check_stringbytes != x ; then
  AC_DEFINE(GC_CHECK_STRING_BYTES, 1,
[Define this temporarily to hunt a bug.  If defined, the size of
   strings is redundantly recorded in sdata structures so that it can
   be compared to the sizes recorded in Lisp strings.])
fi
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if test x$ac_gc_check_string_overrun != x ; then
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  AC_DEFINE(GC_CHECK_STRING_OVERRUN, 1,
[Define this to check for short string overrun.])
fi
if test x$ac_gc_check_string_free_list != x ; then
  AC_DEFINE(GC_CHECK_STRING_FREE_LIST, 1,
[Define this to check the string free list.])
fi
if test x$ac_xmalloc_overrun != x ; then
  AC_DEFINE(XMALLOC_OVERRUN_CHECK, 1,
[Define this to check for malloc buffer overrun.])
fi
if test x$ac_gc_check_cons_list != x ; then
  AC_DEFINE(GC_CHECK_CONS_LIST, 1,
[Define this to check for errors in cons list.])
fi
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if test x$ac_glyphs_debug != x ; then
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  AC_DEFINE(GLYPH_DEBUG, 1,
[Define this to enable glyphs debugging code.])
fi
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AC_ARG_ENABLE(check-lisp-object-type,
[AS_HELP_STRING([--enable-check-lisp-object-type],
                [enable compile time checks for the Lisp_Object data type.
		This is useful for development for catching certain types of bugs.])],
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if test "${enableval}" != "no"; then
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   AC_DEFINE(CHECK_LISP_OBJECT_TYPE, 1,
   [Define this to enable compile time checks for the Lisp_Object data type.])
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fi)


AC_ARG_ENABLE(profiling,
[AS_HELP_STRING([--enable-profiling],
		[build emacs with profiling support.
		 This might not work on all platforms])],
[ac_enable_profiling="${enableval}"],[])
if test x$ac_enable_profiling != x ; then
   PROFILING_CFLAGS="-DPROFILING=1 -pg"
else
   PROFILING_CFLAGS=
fi
AC_SUBST(PROFILING_CFLAGS)

AC_ARG_ENABLE(autodepend,
[AS_HELP_STRING([--enable-autodepend],
		[automatically generate dependencies to .h-files.
 		 Requires GNU Make and Gcc. Enabled if GNU Make and Gcc is
 		 found])],
[ac_enable_autodepend="${enableval}"],[ac_enable_autodepend=yes])

#### Make srcdir absolute, if it isn't already.  It's important to
#### avoid running the path through pwd unnecessarily, since pwd can
#### give you automounter prefixes, which can go away.  We do all this
#### so Emacs can find its files when run uninstalled.
## Make sure CDPATH doesn't affect cd (in case PWD is relative).
unset CDPATH
case "${srcdir}" in
  /* ) ;;
  . )
    ## We may be able to use the $PWD environment variable to make this
    ## absolute.  But sometimes PWD is inaccurate.
    ## Note: we used to use ${PWD} at the end instead of `pwd`,
    ## but that tested only for a well-formed and valid PWD,
    ## it did not object when PWD was well-formed and valid but just wrong.
    if test ".${PWD}" != "." && test ".`(cd ${PWD} ; sh -c pwd)`" = ".`pwd`"  ;
    then
      srcdir="$PWD"
    else
      srcdir="`(cd ${srcdir}; pwd)`"
    fi
  ;;
  *  ) srcdir="`(cd ${srcdir}; pwd)`" ;;
esac

### Canonicalize the configuration name.

AC_CANONICAL_HOST
canonical=$host
configuration=${host_alias-${build_alias-$host}}

dnl This used to use changequote, but, apart from `changequote is evil'
dnl per the autoconf manual, we can speed up autoconf somewhat by quoting
dnl the great gob of text.  Thus it's not processed for possible expansion.
dnl Just make sure the brackets remain balanced.
dnl
dnl Since Emacs can't find matching pairs of quotes, boundaries are
dnl indicated by comments.
dnl quotation begins
[

### If you add support for a new configuration, add code to this
### switch statement to recognize your configuration name and select
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### the appropriate operating system file.
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### You would hope that you could choose an s/*.h
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### file based on the operating system portion.  However, it turns out
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### that each s/*.h file is pretty manufacturer-specific.
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### So we basically have to have a special case for each
### configuration name.
###
### As far as handling version numbers on operating systems is
### concerned, make sure things will fail in a fixable way.  If
### /etc/MACHINES doesn't say anything about version numbers, be
### prepared to handle anything reasonably.  If version numbers
### matter, be sure /etc/MACHINES says something about it.

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opsys='' unported=no
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case "${canonical}" in

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  ## GNU/Linux and similar ports
  *-*-linux* )
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    opsys=gnu-linux
  ;;

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  ## FreeBSD ports
  *-*-freebsd* )
    opsys=freebsd
  ;;

  ## FreeBSD kernel + glibc based userland
  *-*-kfreebsd*gnu* )
    opsys=gnu-kfreebsd
  ;;

  ## NetBSD ports
  *-*-netbsd* )
    opsys=netbsd
  ;;

  ## OpenBSD ports
  *-*-openbsd* )
    opsys=openbsd
  ;;

  ## Apple Darwin / Mac OS X
  *-apple-darwin* )
    case "${canonical}" in
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      i[3456]86-* )  ;;
      powerpc-* )    ;;
      x86_64-* )     ;;
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      * )            unported=yes ;;
    esac
    opsys=darwin
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    ## Use fink packages if available.
    ## FIXME find a better way to do this: http://debbugs.gnu.org/11507
##    if test -d /sw/include && test -d /sw/lib; then
##      GCC_TEST_OPTIONS="-I/sw/include -L/sw/lib"
##      NON_GCC_TEST_OPTIONS=${GCC_TEST_OPTIONS}
##    fi
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  ;;

  ## HP 9000 series 700 and 800, running HP/UX
  hppa*-hp-hpux10.2* )
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    opsys=hpux10-20
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  ;;
  hppa*-hp-hpux1[1-9]* )
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    opsys=hpux11
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    CFLAGS="-D_INCLUDE__STDC_A1_SOURCE $CFLAGS"
  ;;

  ## IBM machines
  rs6000-ibm-aix4.[23]* )
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    opsys=aix4-2
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  ;;
  powerpc-ibm-aix4.[23]*  )
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    opsys=aix4-2
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  ;;
  rs6000-ibm-aix[56]* )
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    opsys=aix4-2
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  ;;
  powerpc-ibm-aix[56]*  )
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    opsys=aix4-2
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  ;;

  ## Silicon Graphics machines
  ## Iris 4D
  mips-sgi-irix6.5 )
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    opsys=irix6-5
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    # Without defining _LANGUAGE_C, things get masked out in the headers
    # so that, for instance, grepping for `free' in stdlib.h fails and
    # AC_HEADER_STD_C fails.   (MIPSPro 7.2.1.2m compilers, Irix 6.5.3m).
    NON_GCC_TEST_OPTIONS="-D_LANGUAGE_C"
  ;;

  ## Suns
  *-sun-solaris* \
    | i[3456]86-*-solaris2* | i[3456]86-*-sunos5* \
    | x86_64-*-solaris2*    | x86_64-*-sunos5*)
    case "${canonical}" in
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      i[3456]86-*-* )   ;;
      amd64-*-*|x86_64-*-*) ;;
      sparc* )		;;
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      * )		unported=yes ;;
    esac
    case "${canonical}" in
      *-sunos5.6* | *-solaris2.6* )
		opsys=sol2-6
		RANLIB="ar -ts"
		;;
      *-sunos5.[7-9]* | *-solaris2.[7-9]* )
		opsys=sol2-6
		emacs_check_sunpro_c=yes
		;;
      *-sunos5* | *-solaris* )
		opsys=sol2-10
		emacs_check_sunpro_c=yes
		;;
    esac
    ## Watch out for a compiler that we know will not work.
    case "${canonical}" in
     *-solaris* | *-sunos5* )
		if [ "x$CC" = x/usr/ucb/cc ]; then
		  ## /usr/ucb/cc doesn't work;
		  ## we should find some other compiler that does work.
		  unset CC
		fi
		;;
      *) ;;
    esac
  ;;

  ## Intel 386 machines where we don't care about the manufacturer.
  i[3456]86-*-* )
    case "${canonical}" in
      *-cygwin )                opsys=cygwin ;;
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      *-darwin* )               opsys=darwin ;;
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      *-sysv4.2uw* )	  	opsys=unixware ;;
      *-sysv5uw* )	  	opsys=unixware ;;
      *-sysv5OpenUNIX* )  	opsys=unixware ;;
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      ## Otherwise, we'll fall through to the generic opsys code at the bottom.
    esac
  ;;

  * )
    unported=yes
  ;;
esac

### If the code above didn't choose an operating system, just choose
### an operating system based on the configuration name.  You really
### only want to use this when you have no idea what the right
### operating system is; if you know what operating systems a machine
### runs, it's cleaner to make it explicit in the case statement
### above.
if test x"${opsys}" = x; then
  case "${canonical}" in
    *-gnu* )				opsys=gnu ;;
    * )
      unported=yes
    ;;
  esac
fi

]
dnl quotation ends

if test $unported = yes; then
  AC_MSG_ERROR([Emacs hasn't been ported to `${canonical}' systems.
Check `etc/MACHINES' for recognized configuration names.])
fi


#### Choose a compiler.
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dnl Sets GCC=yes if using gcc.
AC_PROG_CC
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AM_PROG_CC_C_O

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if test x$GCC = xyes; then
  test "x$GCC_TEST_OPTIONS" != x && CC="$CC $GCC_TEST_OPTIONS"
else
  test "x$NON_GCC_TEST_OPTIONS" != x && CC="$CC $NON_GCC_TEST_OPTIONS"
fi

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# Initialize gnulib right after choosing the compiler.
gl_EARLY

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AC_ARG_ENABLE([gcc-warnings],
  [AS_HELP_STRING([--enable-gcc-warnings],
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                  [turn on lots of GCC warnings. This is intended for
		   developers, and may generate false alarms when used
		   with older or non-GNU development tools.])],
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  [case $enableval in
     yes|no) ;;
     *)      AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;;
   esac
   gl_gcc_warnings=$enableval],
  [gl_gcc_warnings=no]
)

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AC_ARG_ENABLE(link-time-optimization,
[AS_HELP_STRING([--enable-link-time-optimization],
                [build emacs with link-time optimization.
                 This is supported only for GCC since 4.5.0.])],
if test "${enableval}" != "no"; then
   AC_MSG_CHECKING([whether link-time optimization is supported])
   ac_lto_supported=no
   if test x$GCC = xyes; then
      CPUS=`getconf _NPROCESSORS_ONLN 2>/dev/null`
      if test x$CPUS != x; then
      	 LTO="-flto=$CPUS"
      else
	 LTO="-flto"
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      fi
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      old_CFLAGS=$CFLAGS
      CFLAGS="$CFLAGS $LTO"
      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
      	[ac_lto_supported=yes], [ac_lto_supported=no])
      CFLAGS="$old_CFLAGS"
   fi
   AC_MSG_RESULT([$ac_lto_supported])
   if test "$ac_lto_supported" = "yes"; then
      CFLAGS="$CFLAGS $LTO"
   fi
fi)

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# gl_GCC_VERSION_IFELSE([major], [minor], [run-if-found], [run-if-not-found])
# ------------------------------------------------
# If $CPP is gcc-MAJOR.MINOR or newer, then run RUN-IF-FOUND.
# Otherwise, run RUN-IF-NOT-FOUND.
AC_DEFUN([gl_GCC_VERSION_IFELSE],
  [AC_PREPROC_IFELSE(
    [AC_LANG_PROGRAM(
      [[
#if ($1) < __GNUC__ || (($1) == __GNUC__ && ($2) <= __GNUC_MINOR__)
/* ok */
#else
# error "your version of gcc is older than $1.$2"
#endif
      ]]),
    ], [$3], [$4])
  ]
)

# When compiling with GCC, prefer -isystem to -I when including system
# include files, to avoid generating useless diagnostics for the files.
if test "$gl_gcc_warnings" != yes; then
  isystem='-I'
else
  isystem='-isystem '

  # This, $nw, is the list of warnings we disable.
  nw=

  case $with_x_toolkit in
    lucid | athena | motif)
       # Old toolkits mishandle 'const'.
       nw="$nw -Wwrite-strings"
       ;;
    *)
       gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
       ;;
  esac
  AC_SUBST([WERROR_CFLAGS])

  nw="$nw -Waggregate-return"       # anachronistic
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  nw="$nw -Wlong-long"              # C90 is anachronistic
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  nw="$nw -Wc++-compat"             # We don't care about C++ compilers
  nw="$nw -Wundef"                  # Warns on '#if GNULIB_FOO' etc in gnulib
  nw="$nw -Wtraditional"            # Warns on #elif which we use often
  nw="$nw -Wcast-qual"              # Too many warnings for now
  nw="$nw -Wconversion"             # Too many warnings for now
  nw="$nw -Wsystem-headers"         # Don't let system headers trigger warnings
  nw="$nw -Wsign-conversion"        # Too many warnings for now
  nw="$nw -Woverlength-strings"     # Not a problem these days
  nw="$nw -Wtraditional-conversion" # Too many warnings for now
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  nw="$nw -Wunreachable-code"       # so buggy that it's now silently ignored
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  nw="$nw -Wpadded"                 # Our structs are not padded
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  nw="$nw -Wredundant-decls"        # we regularly (re)declare functions
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  nw="$nw -Wlogical-op"             # any use of fwrite provokes this
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  nw="$nw -Wformat-nonliteral"      # we do this a lot
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  nw="$nw -Wvla"                    # warnings in gettext.h
  nw="$nw -Wnested-externs"         # use of XARGMATCH/verify_function__
  nw="$nw -Wswitch-enum"            # Too many warnings for now
  nw="$nw -Wswitch-default"         # Too many warnings for now
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  nw="$nw -Wfloat-equal"            # warns about high-quality code
  nw="$nw -Winline"                 # OK to ignore 'inline'
  nw="$nw -Wsync-nand"              # irrelevant here, and provokes ObjC warning
  nw="$nw -Wunsafe-loop-optimizations" # OK to suppress unsafe optimizations
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  # Emacs doesn't care about shadowing; see
  # <http://lists.gnu.org/archive/html/emacs-diffs/2011-11/msg00265.html>.
  nw="$nw -Wshadow"

  # The following lines should be removable at some point.
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  nw="$nw -Wstack-protector"
  nw="$nw -Wstrict-overflow"
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  nw="$nw -Wsuggest-attribute=pure"

  gl_MANYWARN_ALL_GCC([ws])
  gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
  for w in $ws; do
    gl_WARN_ADD([$w])
  done
  gl_WARN_ADD([-Wno-missing-field-initializers]) # We need this one
  gl_WARN_ADD([-Wno-sign-compare])     # Too many warnings for now
  gl_WARN_ADD([-Wno-type-limits])      # Too many warnings for now
  gl_WARN_ADD([-Wno-switch])           # Too many warnings for now
  gl_WARN_ADD([-Wno-unused-parameter]) # Too many warnings for now
  gl_WARN_ADD([-Wno-format-nonliteral])

  # In spite of excluding -Wlogical-op above, it is enabled, as of
  # gcc 4.5.0 20090517.
  gl_WARN_ADD([-Wno-logical-op])

  gl_WARN_ADD([-fdiagnostics-show-option])
  gl_WARN_ADD([-funit-at-a-time])

  AC_DEFINE([lint], [1], [Define to 1 if the compiler is checking for lint.])
  AC_DEFINE([_FORTIFY_SOURCE], [2],
    [enable compile-time and run-time bounds-checking, and some warnings])
  AC_DEFINE([GNULIB_PORTCHECK], [1], [enable some gnulib portability checks])

  # We use a slightly smaller set of warning options for lib/.
  # Remove the following and save the result in GNULIB_WARN_CFLAGS.
  nw=
  nw="$nw -Wunused-macros"

  gl_MANYWARN_COMPLEMENT([GNULIB_WARN_CFLAGS], [$WARN_CFLAGS], [$nw])
  AC_SUBST([GNULIB_WARN_CFLAGS])
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fi



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dnl Some other nice autoconf tests.
dnl These are commented out, since gl_EARLY and/or Autoconf already does them.
dnl AC_PROG_INSTALL
dnl AC_PROG_MKDIR_P
dnl if test "x$RANLIB" = x; then
dnl   AC_PROG_RANLIB
dnl fi
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AC_PROG_LN_S
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AC_PATH_PROG(INSTALL_INFO, install-info, :,
  $PATH$PATH_SEPARATOR/usr/sbin$PATH_SEPARATOR/sbin)
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dnl Don't use GZIP, which is used by gzip for additional parameters.
AC_PATH_PROG(GZIP_PROG, gzip)

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if test $opsys = gnu-linux; then
  AC_PATH_PROG(PAXCTL, paxctl,,
    [$PATH$PATH_SEPARATOR/sbin$PATH_SEPARATOR/usr/sbin])
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  if test "X$PAXCTL" != X; then
    AC_MSG_CHECKING([whether binaries have a PT_PAX_FLAGS header])
    AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
      [if $PAXCTL -v conftest$EXEEXT >/dev/null 2>&1; then AC_MSG_RESULT(yes)
      else AC_MSG_RESULT(no); PAXCTL=""; fi])
  fi
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fi
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## Need makeinfo >= 4.7 (?) to build the manuals.
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AC_PATH_PROG(MAKEINFO, makeinfo, no)
dnl By this stage, configure has already checked for egrep and set EGREP,
dnl or exited with an error if no egrep was found.
if test "$MAKEINFO" != "no" && \
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  test x"`$MAKEINFO --version 2> /dev/null | $EGREP 'texinfo[[^0-9]]*([[1-4]][[0-9]]+|[[5-9]]|4\.[[7-9]]|4\.[[1-6]][[0-9]]+)'`" = x; then
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   MAKEINFO=no
fi

## Makeinfo is unusual.  For a released Emacs, the manuals are
## pre-built, and not deleted by the normal clean rules.  makeinfo is
## therefore in the category of "special tools" not normally required, which
## configure does not have to check for (eg autoconf itself).
## In a Bazaar checkout on the other hand, the manuals are not included.
## So makeinfo is a requirement to build from Bazaar, and configure
## should test for it as it does for any other build requirement.
## We use the presence of $srcdir/info/emacs to distinguish a release,
## with pre-built manuals, from a Bazaar checkout.
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HAVE_MAKEINFO=yes

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if test "$MAKEINFO" = "no"; then
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  MAKEINFO=makeinfo
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  if test "x${with_makeinfo}" = "xno"; then
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    HAVE_MAKEINFO=no
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  elif test ! -e $srcdir/info/emacs; then
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    AC_MSG_ERROR( [You do not seem to have makeinfo >= 4.7, and your
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source tree does not seem to have pre-built manuals in the `info' directory.
Either install a suitable version of makeinfo, or re-run configure
with the `--without-makeinfo' option to build without the manuals.] )
  fi
fi
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AC_SUBST(HAVE_MAKEINFO)
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dnl Just so that there is only a single place we need to edit.
INFO_EXT=.info
INFO_OPTS=--no-split
AC_SUBST(INFO_EXT)
AC_SUBST(INFO_OPTS)

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dnl Add our options to ac_link now, after it is set up.

if test x$GCC = xyes; then
  test "x$GCC_LINK_TEST_OPTIONS" != x && \
    ac_link="$ac_link $GCC_LINK_TEST_OPTIONS"
else
  test "x$NON_GCC_LINK_TEST_OPTIONS" != x && \
    ac_link="$ac_link $NON_GCC_LINK_TEST_OPTIONS"
fi

dnl We need -znocombreloc if we're using a relatively recent GNU ld.
dnl If we can link with the flag, it shouldn't do any harm anyhow.
dnl (Don't use `-z nocombreloc' as -z takes no arg on Irix.)
dnl Treat GCC specially since it just gives a non-fatal `unrecognized option'
dnl if not built to support GNU ld.

late_LDFLAGS=$LDFLAGS
if test x$GCC = xyes; then
  LDFLAGS="$LDFLAGS -Wl,-znocombreloc"
else
  LDFLAGS="$LDFLAGS -znocombreloc"
fi

AC_MSG_CHECKING([for -znocombreloc])
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
  [AC_MSG_RESULT(yes)],
  LDFLAGS=$late_LDFLAGS
  [AC_MSG_RESULT(no)])


dnl The function dump-emacs will not be defined and temacs will do
dnl (load "loadup") automatically unless told otherwise.
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test "x$CANNOT_DUMP" = "x" && CANNOT_DUMP=no
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case "$opsys" in
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  your-opsys-here) CANNOT_DUMP=yes ;;
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esac
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test "$CANNOT_DUMP" = "yes" && \
  AC_DEFINE(CANNOT_DUMP, 1, [Define if Emacs cannot be dumped on your system.])

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AC_SUBST(CANNOT_DUMP)


UNEXEC_OBJ=unexelf.o
case "$opsys" in
  # MSDOS uses unexcoff.o
  # MSWindows uses unexw32.o
  aix4-2)
   UNEXEC_OBJ=unexaix.o
   ;;
  cygwin)
   UNEXEC_OBJ=unexcw.o
   ;;
  darwin)
   UNEXEC_OBJ=unexmacosx.o
   ;;
  hpux10-20 | hpux11)
   UNEXEC_OBJ=unexhp9k800.o
   ;;
  sol2-10)
   # Use the Solaris dldump() function, called from unexsol.c, to dump
   # emacs, instead of the generic ELF dump code found in unexelf.c.
   # The resulting binary has a complete symbol table, and is better
   # for debugging and other observability tools (debuggers, pstack, etc).
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   #
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   # If you encounter a problem using dldump(), please consider sending
   # a message to the OpenSolaris tools-linking mailing list:
   #      http://mail.opensolaris.org/mailman/listinfo/tools-linking
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   #
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   # It is likely that dldump() works with older Solaris too, but this has
   # not been tested, so for now this change is for Solaris 10 or newer.
   UNEXEC_OBJ=unexsol.o
   ;;
esac

LD_SWITCH_SYSTEM=
case "$opsys" in
  freebsd)
   ## Let `ld' find image libs and similar things in /usr/local/lib.
   ## The system compiler, GCC, has apparently been modified to not
   ## look there, contrary to what a stock GCC would do.
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### It's not our place to do this.  See bug#10313#17.
###   LD_SWITCH_SYSTEM=-L/usr/local/lib
      :
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   ;;

  gnu-linux)
   ## cpp test was "ifdef __mips__", but presumably this is equivalent...
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   case $host_cpu in mips*) LD_SWITCH_SYSTEM="-G 0";; esac
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   ;;

  netbsd)
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### It's not our place to do this.  See bug#10313#17.
###   LD_SWITCH_SYSTEM="-Wl,-rpath,/usr/pkg/lib -L/usr/pkg/lib -Wl,-rpath,/usr/local/lib -L/usr/local/lib"
      :
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   ;;

  openbsd)
   ## Han Boetes <han@mijncomputer.nl> says this is necessary,
   ## otherwise Emacs dumps core on elf systems.
   LD_SWITCH_SYSTEM="-Z"
   ;;
esac
AC_SUBST(LD_SWITCH_SYSTEM)

ac_link="$ac_link $LD_SWITCH_SYSTEM"

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## This setting of LD_SWITCH_SYSTEM references LD_SWITCH_X_SITE_RPATH,
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## which has not been defined yet.  When this was handled with cpp,
## it was expanded to null when configure sourced the s/*.h file.
## Thus LD_SWITCH_SYSTEM had different values in configure and the Makefiles.
## FIXME it would be cleaner to put this in LD_SWITCH_SYSTEM_TEMACS
## (or somesuch), but because it is supposed to go at the _front_
## of LD_SWITCH_SYSTEM, we cannot do that in exactly the same way.
## Compare with the gnu-linux case below, which added to the end
## of LD_SWITCH_SYSTEM, and so can instead go at the front of
## LD_SWITCH_SYSTEM_TEMACS.
case "$opsys" in
  netbsd|openbsd)
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   LD_SWITCH_SYSTEM="\$(LD_SWITCH_X_SITE_RPATH) $LD_SWITCH_SYSTEM" ;;
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esac


C_SWITCH_MACHINE=
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case $canonical in
 alpha*)
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  AC_CHECK_DECL([__ELF__])
  if test "$ac_cv_have_decl___ELF__" = "yes"; then
    ## With ELF, make sure that all common symbols get allocated to in the
    ## data section.  Otherwise, the dump of temacs may miss variables in
    ## the shared library that have been initialized.  For example, with
    ## GNU libc, __malloc_initialized would normally be resolved to the
    ## shared library's .bss section, which is fatal.
    if test "x$GCC" = "xyes"; then
      C_SWITCH_MACHINE="-fno-common"
    else
      AC_MSG_ERROR([What gives?  Fix me if DEC Unix supports ELF now.])
    fi
  else
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    UNEXEC_OBJ=unexalpha.o
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  fi
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  ;;
esac
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AC_SUBST(C_SWITCH_MACHINE)

AC_SUBST(UNEXEC_OBJ)

C_SWITCH_SYSTEM=
## Some programs in src produce warnings saying certain subprograms
## are too complex and need a MAXMEM value greater than 2000 for
## additional optimization.  --nils@exp-math.uni-essen.de
test "$opsys" = "aix4.2" && test "x$GCC" != "xyes" && \
  C_SWITCH_SYSTEM="-ma -qmaxmem=4000"
## gnu-linux might need -D_BSD_SOURCE on old libc5 systems.
## It is redundant in glibc2, since we define _GNU_SOURCE.
AC_SUBST(C_SWITCH_SYSTEM)


LIBS_SYSTEM=
case "$opsys" in
  ## IBM's X11R5 uses -lIM and -liconv in AIX 3.2.2.
  aix4-2) LIBS_SYSTEM="-lrts -lIM -liconv" ;;

  freebsd) LIBS_SYSTEM="-lutil" ;;

  hpux*) LIBS_SYSTEM="-l:libdld.sl" ;;

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  sol2*) LIBS_SYSTEM="-lsocket -lnsl" ;;
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  ## Motif needs -lgen.
  unixware) LIBS_SYSTEM="-lsocket -lnsl -lelf -lgen" ;;
esac
AC_SUBST(LIBS_SYSTEM)


### Make sure subsequent tests use flags consistent with the build flags.

if test x"${OVERRIDE_CPPFLAGS}" != x; then
  CPPFLAGS="${OVERRIDE_CPPFLAGS}"
else
  CPPFLAGS="$C_SWITCH_SYSTEM $C_SWITCH_MACHINE $CPPFLAGS"
fi

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# Suppress obsolescent Autoconf test for size_t; Emacs assumes C89 or better.
AC_DEFUN([AC_TYPE_SIZE_T])
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# Likewise for obsolescent test for uid_t, gid_t; Emacs assumes them.
AC_DEFUN([AC_TYPE_UID_T])
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LIB_MATH=-lm
LIB_STANDARD=
START_FILES=
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dnl Current possibilities handled by sed (aix4-2 -> aix,
dnl gnu-linux -> gnu/linux, etc.):
dnl gnu, gnu/linux, gnu/kfreebsd, aix, cygwin, darwin, hpux, irix.
dnl And special cases: berkeley-unix, usg-unix-v, ms-dos, windows-nt.
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SYSTEM_TYPE=`echo $opsys | sed -e 's/[[0-9]].*//' -e 's|-|/|'`
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dnl NB do not use CRT_DIR unquoted here, since it might not be set yet.
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case $opsys in
  cygwin )
    LIB_MATH=
    START_FILES='pre-crt0.o'
    ;;
  darwin )
    ## Adding -lm confuses the dynamic linker, so omit it.
    LIB_MATH=
    START_FILES='pre-crt0.o'
    ;;
  freebsd )
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    LIB_STANDARD='-lgcc -lc -lgcc $(CRT_DIR)/crtn.o'
    START_FILES='pre-crt0.o $(CRT_DIR)/crt1.o $(CRT_DIR)/crti.o'
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    SYSTEM_TYPE=berkeley-unix
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    ;;
  gnu-linux | gnu-kfreebsd )
    LIB_STANDARD='-lgcc -lc -lgcc $(CRT_DIR)/crtn.o'
    START_FILES='pre-crt0.o $(CRT_DIR)/crt1.o $(CRT_DIR)/crti.o'
    ;;
  hpux10-20 | hpux11 )
    LIB_STANDARD=-lc
    START_FILES='pre-crt0.o $(CRT_DIR)/crt0.o'
    ;;
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  dnl NB this may be adjusted below.
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  netbsd | openbsd )
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    LIB_STANDARD='-lgcc -lc -lgcc $(CRT_DIR)/crtend.o'
    START_FILES='pre-crt0.o $(CRT_DIR)/crt0.o $(CRT_DIR)/crtbegin.o'
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    SYSTEM_TYPE=berkeley-unix
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    ;;
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  sol2* | unixware )
    SYSTEM_TYPE=usg-unix-v
    ;;

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esac

AC_SUBST(LIB_MATH)
AC_SUBST(START_FILES)
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AC_DEFINE_UNQUOTED(SYSTEM_TYPE, "$SYSTEM_TYPE",
  [The type of system you are compiling for; sets `system-type'.])
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dnl Not all platforms use crtn.o files.  Check if the current one does.
crt_files=

for file in x $LIB_STANDARD $START_FILES; do
  case "$file" in
    *CRT_DIR*) crt_files="$crt_files `echo $file | sed -e 's|.*/||'`" ;;
  esac
done

if test "x$crt_files" != x; then

  ## If user specified a crt-dir, use that unconditionally.
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  crt_gcc=no

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  if test "X$CRT_DIR" = "X"; then

    CRT_DIR=/usr/lib            # default

    case "$canonical" in
      x86_64-*-linux-gnu* | s390x-*-linux-gnu*)
      ## On x86-64 and s390x GNU/Linux distributions, the standard library
      ## can be in a variety of places.  We only try /usr/lib64 and /usr/lib.
      ## For anything else (eg /usr/lib32), it is up the user to specify
      ## the location (bug#5655).
      ## Test for crtn.o, not just the directory, because sometimes the
      ## directory exists but does not have the relevant files (bug#1287).
      ## FIXME better to test for binary compatibility somehow.
      test -e /usr/lib64/crtn.o && CRT_DIR=/usr/lib64
      ;;

      powerpc64-*-linux-gnu* | sparc64-*-linux-gnu*) CRT_DIR=/usr/lib64 ;;
    esac

    case "$opsys" in
      hpux10-20) CRT_DIR=/lib ;;
    esac

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    test "x${GCC}" = xyes && crt_gcc=yes

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  fi                            # CRT_DIR = ""

  crt_missing=

  for file in $crt_files; do

    ## If we're using gcc, try to determine it automatically by asking
    ## gcc.  [If this doesn't work, CRT_DIR will remain at the
    ## system-dependent default from above.]
    if test $crt_gcc = yes && test ! -e $CRT_DIR/$file; then

       crt_file=`$CC --print-file-name=$file 2>/dev/null`
       case "$crt_file" in
         */*)
           CRT_DIR=`AS_DIRNAME(["$crt_file"])`
           ;;
       esac
    fi

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    dnl We expect all the files to be in a single directory, so after the
    dnl first there is no point asking gcc.
    crt_gcc=no

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    test -e $CRT_DIR/$file || crt_missing="$crt_missing $file"
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  done                          # $crt_files

  test "x$crt_missing" = x || \
    AC_MSG_ERROR([Required file(s) not found:$crt_missing
Try using the --with-crt-dir option.])

fi                              # crt_files != ""

AC_SUBST(CRT_DIR)

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case $opsys in
  netbsd | openbsd )
    if test -f $CRT_DIR/crti.o; then

        test -f $CRT_DIR/crtn.o || \
          AC_MSG_ERROR([Required file not found: crtn.o])

        LIB_STANDARD='-lgcc -lc -lgcc $(CRT_DIR)/crtend.o $(CRT_DIR)/crtn.o'
        START_FILES='pre-crt0.o $(CRT_DIR)/crt0.o $(CRT_DIR)/crti.o $(CRT_DIR)/crtbegin.o'
    fi
    ;;
esac

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pre_PKG_CONFIG_CFLAGS=$CFLAGS
pre_PKG_CONFIG_LIBS=$LIBS
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AC_PATH_PROG(PKG_CONFIG, pkg-config, no)

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dnl This function definition taken from Gnome 2.0
dnl PKG_CHECK_MODULES(GSTUFF, gtk+-2.0 >= 1.3 glib = 1.3.4, action-if, action-not)
dnl defines GSTUFF_LIBS, GSTUFF_CFLAGS, see pkg-config man page
dnl also defines GSTUFF_PKG_ERRORS on error
AC_DEFUN([PKG_CHECK_MODULES], [
  succeeded=no

  if test "$PKG_CONFIG" = "no" ; then
     ifelse([$4], , [AC_MSG_ERROR([
      *** The pkg-config script could not be found. Make sure it is in your path, or give the full path to pkg-config with the PKG_CONFIG environment variable or --with-pkg-config-prog.  Or see http://www.freedesktop.org/software/pkgconfig to get pkg-config.])], [$4])
  else
     PKG_CONFIG_MIN_VERSION=0.9.0
     if $PKG_CONFIG --atleast-pkgconfig-version $PKG_CONFIG_MIN_VERSION; then
        AC_MSG_CHECKING(for $2)

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        if $PKG_CONFIG --exists "$2" 2>&AS_MESSAGE_LOG_FD &&
	   $1_CFLAGS=`$PKG_CONFIG --cflags "$2" 2>&AS_MESSAGE_LOG_FD` &&
	   $1_LIBS=`$PKG_CONFIG --libs "$2" 2>&AS_MESSAGE_LOG_FD`; then
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	    edit_cflags="
	      s,///*,/,g
	      s/^/ /
	      s/ -I/ $isystem/g
	      s/^ //
	    "
	    $1_CFLAGS=`AS_ECHO(["$$1_CFLAGS"]) | sed -e "$edit_cflags"`
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	    $1_LIBS=`AS_ECHO(["$$1_LIBS"]) | sed -e 's,///*,/,g'`
            AC_MSG_RESULT([yes CFLAGS='$$1_CFLAGS' LIBS='$$1_LIBS'])
            succeeded=yes
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        else
            AC_MSG_RESULT(no)
            $1_CFLAGS=""
            $1_LIBS=""
            ## If we have a custom action on failure, don't print errors, but
            ## do set a variable so people can do so.
            $1_PKG_ERRORS=`$PKG_CONFIG --errors-to-stdout --print-errors "$2"`
            ifelse([$4], ,echo $$1_PKG_ERRORS,)
        fi

        AC_SUBST($1_CFLAGS)
        AC_SUBST($1_LIBS)
     else
        echo "*** Your version of pkg-config is too old. You need version $PKG_CONFIG_MIN_VERSION or newer."
        echo "*** See http://www.freedesktop.org/software/pkgconfig"
     fi
  fi

  if test $succeeded = yes; then
     ifelse([$3], , :, [$3])
  else
     ifelse([$4], , [AC_MSG_ERROR([Library requirements ($2) not met; consider adjusting the PKG_CONFIG_PATH environment variable if your libraries are in a nonstandard prefix so pkg-config can find them.])], [$4])
  fi
])


if test "${with_sound}" != "no"; then
  # Sound support for GNU/Linux and the free BSDs.
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  AC_CHECK_HEADERS(machine/soundcard.h sys/soundcard.h soundcard.h,
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    have_sound_header=yes)
  # Emulation library used on NetBSD.
  AC_CHECK_LIB(ossaudio, _oss_ioctl, LIBSOUND=-lossaudio, LIBSOUND=)
  AC_SUBST(LIBSOUND)

  ALSA_REQUIRED=1.0.0
  ALSA_MODULES="alsa >= $ALSA_REQUIRED"
  PKG_CHECK_MODULES(ALSA, $ALSA_MODULES, HAVE_ALSA=yes, HAVE_ALSA=no)
  if test $HAVE_ALSA = yes; then
    SAVE_CFLAGS="$CFLAGS"
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    SAVE_LIBS="$LIBS"
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    CFLAGS="$ALSA_CFLAGS $CFLAGS"
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    LIBS="$ALSA_LIBS $LIBS"
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    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <asoundlib.h>]], [[snd_lib_error_set_handler (0);]])],
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                    emacs_alsa_normal=yes,
	            emacs_alsa_normal=no)
    if test "$emacs_alsa_normal" != yes; then
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      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <alsa/asoundlib.h>]],
                     [[snd_lib_error_set_handler (0);]])],
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                     emacs_alsa_subdir=yes,
	             emacs_alsa_subdir=no)
      if test "$emacs_alsa_subdir" != yes; then
        AC_MSG_ERROR([pkg-config found alsa, but it does not compile.  See config.log for error messages.])
      fi
      ALSA_CFLAGS="$ALSA_CFLAGS -DALSA_SUBDIR_INCLUDE"
    fi

    CFLAGS="$SAVE_CFLAGS"
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    LIBS="$SAVE_LIBS"
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    LIBSOUND="$LIBSOUND $ALSA_LIBS"
    CFLAGS_SOUND="$CFLAGS_SOUND $ALSA_CFLAGS"
    AC_DEFINE(HAVE_ALSA, 1, [Define to 1 if ALSA is available.])
  fi

  dnl Define HAVE_SOUND if we have sound support.  We know it works and
  dnl compiles only on the specified platforms.  For others, it
  dnl probably doesn't make sense to try.
  if test x$have_sound_header = xyes || test $HAVE_ALSA = yes; then
     case "$opsys" in
       dnl defined __FreeBSD__ || defined __NetBSD__ || defined __linux__
       gnu-linux|freebsd|netbsd)
         AC_DEFINE(HAVE_SOUND, 1, [Define to 1 if you have sound support.])
         ;;
     esac
  fi

  AC_SUBST(CFLAGS_SOUND)
fi

dnl checks for header files
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AC_CHECK_HEADERS_ONCE(
  linux/version.h sys/systeminfo.h
  stdio_ext.h fcntl.h coff.h pty.h
  sys/vlimit.h sys/resource.h
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  sys/utsname.h pwd.h utmp.h dirent.h util.h)

AC_MSG_CHECKING(if personality LINUX32 can be set)
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/personality.h>]], [[personality (PER_LINUX32)]])],
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               emacs_cv_personality_linux32=yes,
	       emacs_cv_personality_linux32=no)
AC_MSG_RESULT($emacs_cv_personality_linux32)

if test $emacs_cv_personality_linux32 = yes; then
  AC_DEFINE(HAVE_PERSONALITY_LINUX32, 1,
            [Define to 1 if personality LINUX32 can be set.])
fi

dnl On Solaris 8 there's a compilation warning for term.h because
dnl it doesn't define `bool'.
AC_CHECK_HEADERS(term.h, , , -)
AC_HEADER_TIME
AC_CHECK_DECLS([sys_siglist])
if test $ac_cv_have_decl_sys_siglist != yes; then
  # For Tru64, at least:
  AC_CHECK_DECLS([__sys_siglist])
  if test $ac_cv_have_decl___sys_siglist = yes; then
    AC_DEFINE(sys_siglist, __sys_siglist,
              [Define to any substitute for sys_siglist.])
  fi
fi
AC_HEADER_SYS_WAIT

dnl Check for speed_t typedef.
AC_CACHE_CHECK(for speed_t, emacs_cv_speed_t,
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  [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <termios.h>]], [[speed_t x = 1;]])],
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    emacs_cv_speed_t=yes, emacs_cv_speed_t=no)])
if test $emacs_cv_speed_t = yes; then
  AC_DEFINE(HAVE_SPEED_T, 1,
  	   [Define to 1 if `speed_t' is declared by <termios.h>.])
fi

AC_CACHE_CHECK(for struct exception, emacs_cv_struct_exception,
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <math.h>]],
[[static struct exception x; x.arg1 = x.arg2 = x.retval; x.name = ""; x.type = 1;]])],
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  emacs_cv_struct_exception=yes, emacs_cv_struct_exception=no))
HAVE_EXCEPTION=$emacs_cv_struct_exception
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dnl Define on Darwin so emacs symbols will not conflict with those
dnl in the System framework.  Otherwise -prebind will not work.
if test $emacs_cv_struct_exception != yes || test $opsys = darwin; then
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  AC_DEFINE(NO_MATHERR, 1, [Define to 1 if you don't have struct exception in math.h.])
fi

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AC_CHECK_HEADERS_ONCE(sys/socket.h)
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AC_CHECK_HEADERS(net/if.h, , , [AC_INCLUDES_DEFAULT
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif])
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AC_CHECK_HEADERS(ifaddrs.h, , , [AC_INCLUDES_DEFAULT
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif])
AC_CHECK_HEADERS(net/if_dl.h, , , [AC_INCLUDES_DEFAULT
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif])
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dnl checks for structure members
AC_CHECK_MEMBERS([struct ifreq.ifr_flags, struct ifreq.ifr_hwaddr,
		  struct ifreq.ifr_netmask, struct ifreq.ifr_broadaddr,
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		  struct ifreq.ifr_addr,
		  struct ifreq.ifr_addr.sa_len], , ,
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		 [AC_INCLUDES_DEFAULT
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NET_IF_H
#include <net/if.h>
#endif])

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dnl Check for endianness.
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dnl AC_C_BIGENDIAN is done by gnulib.
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dnl check for Make feature
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dnl AC_PROG_MAKE_SET is done by Automake.
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DEPFLAGS=
MKDEPDIR=":"
deps_frag=deps.mk
dnl check for GNU Make if we have GCC and autodepend is on.
if test "$GCC" = yes && test "$ac_enable_autodepend" = yes; then
   AC_MSG_CHECKING([whether we are using GNU Make])
   HAVE_GNU_MAKE=no
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   testval=`${MAKE-make} --version 2>/dev/null | grep 'GNU Make'`
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   if test "x$testval" != x; then
      HAVE_GNU_MAKE=yes
   else
      ac_enable_autodepend=no
   fi
   AC_MSG_RESULT([$HAVE_GNU_MAKE])
   if test $HAVE_GNU_MAKE = yes; then
      AC_MSG_CHECKING([whether gcc understands -MMD -MF])
      SAVE_CFLAGS="$CFLAGS"
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      CFLAGS="$CFLAGS -MMD -MF deps.d -MP"
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      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])], , ac_enable_autodepend=no)
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      CFLAGS="$SAVE_CFLAGS"
      test -f deps.d || ac_enable_autodepend=no
      rm -rf deps.d
      AC_MSG_RESULT([$ac_enable_autodepend])
   fi
   if test $ac_enable_autodepend = yes; then
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      DEPFLAGS='-MMD -MF ${DEPDIR}/$*.d -MP'
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      ## MKDIR_P is documented (see AC_PROG_MKDIR_P) to be parallel-safe.
      MKDEPDIR='${MKDIR_P} ${DEPDIR}'
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      deps_frag=autodeps.mk
   fi
fi
deps_frag=$srcdir/src/$deps_frag
AC_SUBST(MKDEPDIR)
AC_SUBST(DEPFLAGS)
AC_SUBST_FILE(deps_frag)


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lisp_frag=$srcdir/src/lisp.mk
AC_SUBST_FILE(lisp_frag)


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dnl checks for operating system services
AC_SYS_LONG_FILE_NAMES

#### Choose a window system.

AC_PATH_X
if test "$no_x" = yes; then
  window_system=none
else
  window_system=x11
fi

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LD_SWITCH_X_SITE_RPATH=
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if test "${x_libraries}" != NONE; then
  if test -n "${x_libraries}"; then
    LD_SWITCH_X_SITE=-L`echo ${x_libraries} | sed -e "s/:/ -L/g"`
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    LD_SWITCH_X_SITE_RPATH=-Wl,-rpath,`echo ${x_libraries} | sed -e "s/:/ -Wl,-rpath,/g"`
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  fi
  x_default_search_path=""
  x_search_path=${x_libraries}
  if test -z "${x_search_path}"; then
    x_search_path=/usr/lib
  fi
  for x_library in `echo ${x_search_path}: | \
		    sed -e "s/:/ /g" -e p -e "s:/lib[[^ /]]* :/share :g"`; do
    x_search_path="\
${x_library}/X11/%L/%T/%N%C%S:\
${x_library}/X11/%l/%T/%N%C%S:\
${x_library}/X11/%T/%N%C%S:\
${x_library}/X11/%L/%T/%N%S:\
${x_library}/X11/%l/%T/%N%S:\
${x_library}/X11/%T/%N%S"
    if test x"${x_default_search_path}" = x; then
      x_default_search_path=${x_search_path}
    else
      x_default_search_path="${x_search_path}:${x_default_search_path}"
    fi
  done
fi
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AC_SUBST(LD_SWITCH_X_SITE_RPATH)
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if test "${x_includes}" != NONE && test -n "${x_includes}"; then
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  C_SWITCH_X_SITE="$isystem"`echo ${x_includes} | sed -e "s/:/ $isystem/g"`
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fi

if test x"${x_includes}" = x; then
  bitmapdir=/usr/include/X11/bitmaps
else
  # accumulate include directories that have X11 bitmap subdirectories
  bmd_acc="dummyval"
  for bmd in `echo ${x_includes} | sed -e "s/:/ /g"`; do
    if test -d "${bmd}/X11/bitmaps"; then
      bmd_acc="${bmd_acc}:${bmd}/X11/bitmaps"
    fi
    if test -d "${bmd}/bitmaps"; then
      bmd_acc="${bmd_acc}:${bmd}/bitmaps"
    fi
  done
  if test ${bmd_acc} != "dummyval"; then
    bitmapdir=`echo ${bmd_acc} | sed -e "s/^dummyval://"`
  fi
fi

HAVE_NS=no
NS_IMPL_COCOA=no
NS_IMPL_GNUSTEP=no
tmp_CPPFLAGS="$CPPFLAGS"
tmp_CFLAGS="$CFLAGS"
CPPFLAGS="$CPPFLAGS -x objective-c"
CFLAGS="$CFLAGS -x objective-c"
TEMACS_LDFLAGS2="\${LDFLAGS}"
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GNU_OBJC_CFLAGS=
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if test "${with_ns}" != no; then
  if test "${opsys}" = darwin; then
     NS_IMPL_COCOA=yes
     ns_appdir=`pwd`/nextstep/Emacs.app
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     ns_appbindir=${ns_appdir}/Contents/MacOS
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     ns_appresdir=${ns_appdir}/Contents/Resources
     ns_appsrc=${srcdir}/nextstep/Cocoa/Emacs.base
  elif test -f $GNUSTEP_CONFIG_FILE; then
     NS_IMPL_GNUSTEP=yes
     ns_appdir=`pwd`/nextstep/Emacs.app
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     ns_appbindir=${ns_appdir}
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     ns_appresdir=${ns_appdir}/Resources
     ns_appsrc=${srcdir}/nextstep/GNUstep/Emacs.base
     dnl FIXME sourcing this several times in subshells seems inefficient.
     GNUSTEP_SYSTEM_HEADERS="$(. $GNUSTEP_CONFIG_FILE; echo $GNUSTEP_SYSTEM_HEADERS)"
     GNUSTEP_SYSTEM_LIBRARIES="$(. $GNUSTEP_CONFIG_FILE; echo $GNUSTEP_SYSTEM_LIBRARIES)"
     dnl I seemed to need these as well with GNUstep-startup 0.25.
     GNUSTEP_LOCAL_HEADERS="$(. $GNUSTEP_CONFIG_FILE; echo $GNUSTEP_LOCAL_HEADERS)"
     GNUSTEP_LOCAL_LIBRARIES="$(. $GNUSTEP_CONFIG_FILE; echo $GNUSTEP_LOCAL_LIBRARIES)"
     test "x${GNUSTEP_LOCAL_HEADERS}" != "x" && \
       GNUSTEP_LOCAL_HEADERS="-I${GNUSTEP_LOCAL_HEADERS}"
     test "x${GNUSTEP_LOCAL_LIBRARIES}" != "x" && \
       GNUSTEP_LOCAL_LIBRARIES="-L${GNUSTEP_LOCAL_LIBRARIES}"
     CPPFLAGS="$CPPFLAGS -I${GNUSTEP_SYSTEM_HEADERS} ${GNUSTEP_LOCAL_HEADERS}"
     CFLAGS="$CFLAGS -I${GNUSTEP_SYSTEM_HEADERS} ${GNUSTEP_LOCAL_HEADERS}"
     LDFLAGS="$LDFLAGS -L${GNUSTEP_SYSTEM_LIBRARIES} ${GNUSTEP_LOCAL_LIBRARIES}"
     LIB_STANDARD=
     START_FILES=
     TEMACS_LDFLAGS2=
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     dnl GNUstep defines BASE_NATIVE_OBJC_EXCEPTIONS to 0 or 1.
     dnl If they had chosen to either define it or not, we could have
     dnl just used AC_CHECK_DECL here.
     AC_CACHE_CHECK(if GNUstep defines BASE_NATIVE_OBJC_EXCEPTIONS,
       emacs_cv_objc_exceptions,
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <GNUstepBase/GSConfig.h>]],
[[#if defined BASE_NATIVE_OBJC_EXCEPTIONS && BASE_NATIVE_OBJC_EXCEPTIONS > 0
1;
#else
fail;
#endif]])], emacs_cv_objc_exceptions=yes, emacs_cv_objc_exceptions=no ) )
     if test $emacs_cv_objc_exceptions = yes; then
       dnl _NATIVE_OBJC_EXCEPTIONS is used by the GNUstep headers.
       AC_DEFINE(_NATIVE_OBJC_EXCEPTIONS, 1,
         [Define if GNUstep uses ObjC exceptions.])
       GNU_OBJC_CFLAGS="-fobjc-exceptions"
     fi
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  fi
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  dnl This is only used while we test the NS headers, it gets reset below.
  CFLAGS="$CFLAGS $GNU_OBJC_CFLAGS"

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  AC_CHECK_HEADER([AppKit/AppKit.h], [HAVE_NS=yes],
  		  [AC_MSG_ERROR([`--with-ns' was specified, but the include
  files are missing or cannot be compiled.])])
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <Foundation/NSObjCRuntime.h>],
                                     [NSInteger i;])],
		    ns_have_nsinteger=yes,
		    ns_have_nsinteger=no)
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  if test $ns_have_nsinteger = yes; then
    AC_DEFINE(NS_HAVE_NSINTEGER, 1, [Define to 1 if `NSInteger' is defined.])
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  fi
fi
AC_SUBST(TEMACS_LDFLAGS2)

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INSTALL_ARCH_INDEP_EXTRA=install-etc
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ns_self_contained=no
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ns_frag=/dev/null
NS_OBJ=
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NS_OBJC_OBJ=
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if test "${HAVE_NS}" = yes; then
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  if test "$with_toolkit_scroll_bars" = "no"; then
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    AC_MSG_ERROR([Non-toolkit scroll bars are not implemented for Nextstep.])
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  fi

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  window_system=nextstep
  with_xft=no
  # set up packaging dirs
  if test "${EN_NS_SELF_CONTAINED}" = yes; then
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     ns_self_contained=yes
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     prefix=${ns_appresdir}
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     exec_prefix=${ns_appbindir}
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     dnl This one isn't really used, only archlibdir is.
     libexecdir="\${ns_appbindir}/libexec"
     archlibdir="\${ns_appbindir}/libexec"
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     docdir="\${ns_appresdir}/etc"
     etcdir="\${ns_appresdir}/etc"
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     dnl FIXME maybe set datarootdir instead.
     dnl That would also get applications, icons, man.
     infodir="\${ns_appresdir}/info"
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     mandir="\${ns_appresdir}/man"
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     lispdir="\${ns_appresdir}/lisp"
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     leimdir="\${ns_appresdir}/leim"
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     INSTALL_ARCH_INDEP_EXTRA=
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  fi
  ns_frag=$srcdir/src/ns.mk
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  NS_OBJ="fontset.o fringe.o image.o"
  NS_OBJC_OBJ="nsterm.o nsfns.o nsmenu.o nsselect.o nsimage.o nsfont.o"
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fi
CFLAGS="$tmp_CFLAGS"
CPPFLAGS="$tmp_CPPFLAGS"
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AC_SUBST(INSTALL_ARCH_INDEP_EXTRA)
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AC_SUBST(ns_self_contained)
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AC_SUBST(NS_OBJ)
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AC_SUBST(NS_OBJC_OBJ)
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AC_SUBST(LIB_STANDARD)
AC_SUBST_FILE(ns_frag)

case "${window_system}" in
  x11 )
    HAVE_X_WINDOWS=yes
    HAVE_X11=yes
    case "${with_x_toolkit}" in
      athena | lucid ) USE_X_TOOLKIT=LUCID ;;
      motif ) USE_X_TOOLKIT=MOTIF ;;
      gtk ) with_gtk=yes
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dnl Don't set this for GTK.  A lot of tests below assumes Xt when
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dnl USE_X_TOOLKIT is set.
            USE_X_TOOLKIT=none ;;
      gtk3 ) with_gtk3=yes
             USE_X_TOOLKIT=none ;;
      no ) USE_X_TOOLKIT=none ;;
dnl If user did not say whether to use a toolkit, make this decision later:
dnl use the toolkit if we have gtk, or X11R5 or newer.
      * ) USE_X_TOOLKIT=maybe ;;
    esac
  ;;
  nextstep | none )
    HAVE_X_WINDOWS=no
    HAVE_X11=no
    USE_X_TOOLKIT=none
  ;;
esac

if test "$window_system" = none && test "X$with_x" != "Xno"; then
   AC_CHECK_PROG(HAVE_XSERVER, X, true, false)
   if test "$HAVE_XSERVER" = true ||
      test -n "$DISPLAY" ||
      test "`echo /usr/lib/libX11.*`" != "/usr/lib/libX11.*"; then
        AC_MSG_ERROR([You seem to be running X, but no X development libraries
were found.  You should install the relevant development files for X
and for the toolkit you want, such as Gtk+, Lesstif or Motif.  Also make
sure you have development files for image handling, i.e.
tiff, gif, jpeg, png and xpm.
If you are sure you want Emacs compiled without X window support, pass
  --without-x
to configure.])
   fi
fi

### If we're using X11, we should use the X menu package.
HAVE_MENUS=no
case ${HAVE_X11} in
  yes ) HAVE_MENUS=yes ;;
esac

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# Does the opsystem file prohibit the use of the GNU malloc?
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# Assume not, until told otherwise.
GNU_MALLOC=yes
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AC_CACHE_CHECK(
  [whether malloc is Doug Lea style],
  [emacs_cv_var_doug_lea_malloc],
  [AC_LINK_IFELSE(
     [AC_LANG_PROGRAM(
        [[#include <malloc.h>
	  static void hook (void) {}]],
        [[malloc_set_state (malloc_get_state ());
	  __after_morecore_hook = hook;
	  __malloc_initialize_hook = hook;]])],
     [emacs_cv_var_doug_lea_malloc=yes],
     [emacs_cv_var_doug_lea_malloc=no])])
doug_lea_malloc=$emacs_cv_var_doug_lea_malloc
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