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dnl  Autoconf script for GNU Emacs
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dnl To rebuild the `configure' script from this, execute the command
dnl 	autoconf
dnl in the directory containing this script.
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dnl
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dnl  Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2003,
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dnl    2004, 2005, 2006, 2007, 2008, 2009, 2010  Free Software Foundation, Inc.
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dnl
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dnl  This file is part of GNU Emacs.
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dnl
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dnl  GNU Emacs is free software: you can redistribute it and/or modify
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dnl  it under the terms of the GNU General Public License as published by
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dnl  the Free Software Foundation, either version 3 of the License, or
dnl  (at your option) any later version.
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dnl
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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.
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dnl
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dnl  You should have received a copy of the GNU General Public License
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dnl  along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
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AC_PREREQ(2.62)
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AC_INIT(emacs, 24.0.50)
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AC_CONFIG_HEADER(src/config.h:src/config.in)
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AC_CONFIG_SRCDIR(src/lisp.h)
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dnl Support for --program-prefix, --program-suffix and
dnl --program-transform-name options
AC_ARG_PROGRAM

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lispdir='${datadir}/emacs/${version}/lisp'
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locallisppath='${datadir}/emacs/${version}/site-lisp:'\
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'${datadir}/emacs/site-lisp'
lisppath='${locallisppath}:${lispdir}:${datadir}/emacs/${version}/leim'
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etcdir='${datadir}/emacs/${version}/etc'
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archlibdir='${libexecdir}/emacs/${version}/${configuration}'
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docdir='${datadir}/emacs/${version}/etc'
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gamedir='${localstatedir}/games/emacs'
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gameuser=games
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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
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])dnl
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dnl OPTION_DEFAULT_ON(NAME, HELP-STRING)
dnl Create a new --with option that defaults to being enabled.  NAME
dnl   is the base name of the option.  The shell variable with_NAME
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
   m4_bpatsubst([with_$1], [[^0-9a-z]], [_])=yes])dnl
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])dnl

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OPTION_DEFAULT_ON([pop],[don't support POP mail retrieval with movemail])
if test "$with_pop" = yes; then
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   AC_DEFINE(MAIL_USE_POP)
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fi
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AH_TEMPLATE(MAIL_USE_POP, [Define to support POP mail retrieval.])dnl
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OPTION_DEFAULT_OFF([kerberos],[support Kerberos-authenticated POP])
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if test "$with_kerberos" != no; then
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   AC_DEFINE(KERBEROS)
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fi
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AH_TEMPLATE(KERBEROS,
	    [Define to support Kerberos-authenticated POP mail retrieval.])dnl
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OPTION_DEFAULT_OFF([kerberos5],[support Kerberos version 5 authenticated POP])
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if test "${with_kerberos5}" != no; then
  if test "${with_kerberos}" = no; then
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    with_kerberos=yes
    AC_DEFINE(KERBEROS)
  fi
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  AC_DEFINE(KERBEROS5, 1, [Define to use Kerberos 5 instead of Kerberos 4.])
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fi
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OPTION_DEFAULT_OFF([hesiod],[support Hesiod to get the POP server host])
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dnl FIXME hesiod support may not be present, so it seems like an error
dnl to define, or at least use, this unconditionally.
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if test "$with_hesiod" != no; then
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  AC_DEFINE(HESIOD, 1, [Define to support using a Hesiod database to find the POP server.])
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fi
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OPTION_DEFAULT_OFF([mmdf],[support MMDF mailboxes])
if test "$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.]))

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OPTION_DEFAULT_ON([sound],[don't compile with sound support])
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OPTION_DEFAULT_ON([sync-input],[process async input synchronously])
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if test "$with_sync_input" = yes; then
   AC_DEFINE(SYNC_INPUT, 1, [Process async input synchronously.])
fi

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

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OPTION_DEFAULT_ON([xft],[don't use XFT for anti aliased fonts])
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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])

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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])
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OPTION_DEFAULT_ON([dbus],[don't compile with D-Bus support])
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OPTION_DEFAULT_ON([gconf],[don't compile with GConf support])
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OPTION_DEFAULT_ON([selinux],[don't compile with SELinux support])
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## 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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dnl Can remove these in Emacs 24.
AC_ARG_WITH([gtk],,
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  [AC_MSG_ERROR([--with-gtk has been removed.  Use --with-x-toolkit to
specify a toolkit.])],,)
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AC_ARG_WITH([gcc],,
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  [AC_MSG_ERROR([--with-gcc has been removed.  Set the `CC' environment
variable to specify a compiler.])],,)
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AC_ARG_WITH([pkg-config-prog],dnl
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[AS_HELP_STRING([--with-pkg-config-prog=PATH],
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                  [path to pkg-config for finding GTK and librsvg])])
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if test "X${with_pkg_config_prog}" != X; then
   if test "${with_pkg_config_prog}" != yes; then
      PKG_CONFIG="${with_pkg_config_prog}"
   fi
fi
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CRT_DIR=
AC_ARG_WITH([crt-dir],dnl
[AS_HELP_STRING([--with-crt-dir=DIR],[directory containing crtn.o etc.
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The default is /usr/lib, or /usr/lib64 on some platforms.])])
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CRT_DIR="${with_crt_dir}"

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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

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

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AC_ARG_ENABLE(asserts,
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[AS_HELP_STRING([--enable-asserts], [compile code with asserts enabled])],
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      USE_XASSERTS=$enableval,
      USE_XASSERTS=no)

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AC_ARG_ENABLE(maintainer-mode,
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[AS_HELP_STRING([--enable-maintainer-mode],
                [enable make rules and dependencies not useful (and sometimes
		 confusing) to the casual installer])],
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      USE_MAINTAINER_MODE=$enableval,
      USE_MAINTAINER_MODE=no)
if test $USE_MAINTAINER_MODE = yes; then
  MAINT=
else
  MAINT=#
fi
AC_SUBST(MAINT)

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

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AC_ARG_ENABLE(checking,
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[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,
		 xmallocoverrun, conslist])],
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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= ;
	                ac_gc_check_cons_list= ;;
	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 ;
	                ac_gc_check_cons_list=1 ;;
	# 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 ;;
	*)	AC_MSG_ERROR(unknown check category $check) ;;
	esac
done
IFS="$ac_save_IFS"

if test x$ac_enable_checking != x ; then
  AC_DEFINE(ENABLE_CHECKING, 1,
[Enable expensive run-time checking of data types?])
fi
if test x$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
if test x$ac_gc_check_stringoverrun != x ; then
  AC_DEFINE(GC_CHECK_STRING_OVERRUN, 1,
[Define this to check for short string overrun.])
fi
if test x$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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AC_ARG_ENABLE(profiling,
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[AS_HELP_STRING([--enable-profiling],
		[build emacs with profiling support.
		 This might not work on all platforms])],
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[ac_enable_profiling="${enableval}"],[])
if test x$ac_enable_profiling != x ; then
   PROFILING_CFLAGS="-DPROFILING=1 -pg"
   PROFILING_LDFLAGS="-pg"
else
   PROFILING_CFLAGS=
   PROFILING_LDFLAGS=
fi

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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])

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#### Make srcdir absolute, if it isn't already.  It's important to
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#### avoid running the path through pwd unnecessarily, since pwd can
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#### give you automounter prefixes, which can go away.  We do all this
#### so Emacs can find its files when run uninstalled.
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## Make sure CDPATH doesn't affect cd (in case PWD is relative).
unset CDPATH
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case "${srcdir}" in
  /* ) ;;
  . )
    ## We may be able to use the $PWD environment variable to make this
    ## absolute.  But sometimes PWD is inaccurate.
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    ## 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 ${PWD} ; sh -c pwd)`" = ".`pwd`"  ;
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    then
      srcdir="$PWD"
    else
      srcdir="`(cd ${srcdir}; pwd)`"
    fi
  ;;
  *  ) srcdir="`(cd ${srcdir}; pwd)`" ;;
esac

#### Check if the source directory already has a configured system in it.
if test `pwd` != `(cd ${srcdir} && pwd)` \
   && test -f "${srcdir}/src/config.h" ; then
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  AC_MSG_WARN([[The directory tree `${srcdir}' is being used
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   as a build directory right now; it has been configured in its own
   right.  To configure in another directory as well, you MUST
   use GNU make.  If you do not have GNU make, then you must
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   now do `make distclean' in ${srcdir},
   and then run $0 again.]])
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fi

#### Given the configuration name, set machfile and opsysfile to the
#### names of the m/*.h and s/*.h files we should use.

### Canonicalize the configuration name.

AC_CANONICAL_HOST
canonical=$host
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configuration=${host_alias-${build_alias-$host}}
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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.
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dnl
dnl Since Emacs can't find matching pairs of quotes, boundaries are
dnl indicated by comments.
dnl quotation begins
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[
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### If you add support for a new configuration, add code to this
### switch statement to recognize your configuration name and select
### the appropriate operating system and machine description files.

### You would hope that you could choose an m/*.h file pretty much
### based on the machine portion of the configuration name, and an s-
### file based on the operating system portion.  However, it turns out
### that each m/*.h file is pretty manufacturer-specific - for
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### example mips.h is MIPS
### So we basically have to have a special case for each
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### 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.
###
### Eric Raymond says we should accept strings like "sysvr4" to mean
### "System V Release 4"; he writes, "The old convention encouraged
### confusion between `system' and `release' levels'."

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

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  ## FreeBSD ports
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  *-*-freebsd* )
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    opsys=freebsd
    case "${canonical}" in
      alpha*-*-freebsd*)	machine=alpha ;;
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      arm*-*-freebsd*)          machine=arm ;;
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      ia64-*-freebsd*)		machine=ia64 ;;
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      sparc-*-freebsd*)         machine=sparc ;;
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      sparc64-*-freebsd*)	machine=sparc ;;
      powerpc-*-freebsd*)	machine=macppc ;;
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      i[3456]86-*-freebsd*)	machine=intel386 ;;
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      amd64-*-freebsd*|x86_64-*-freebsd*) machine=amdx86-64 ;;
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    esac
  ;;

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  ## FreeBSD kernel + glibc based userland
  *-*-kfreebsd*gnu* )
    opsys=gnu-kfreebsd
    case "${canonical}" in
      alpha*-*-kfreebsd*)	machine=alpha ;;
      ia64-*-kfreebsd*)		machine=ia64 ;;
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      sparc-*-kfreebsd*)	machine=sparc ;;
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      sparc64-*-kfreebsd*)	machine=sparc ;;
      powerpc-*-kfreebsd*)	machine=macppc ;;
      i[3456]86-*-kfreebsd*)	machine=intel386 ;;
      amd64-*-kfreebsd*|x86_64-*-kfreebsd*) machine=amdx86-64 ;;
    esac
  ;;

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  ## NetBSD ports
  *-*-netbsd* )
    opsys=netbsd
    case "${canonical}" in
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      alpha*-*-netbsd*)	machine=alpha ;;
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      i[3456]86-*-netbsd*) machine=intel386 ;;
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      mips-*-netbsd*)	machine=mips ;;
      mipsel-*-netbsd*)	machine=mips ;;
      mipseb-*-netbsd*)	machine=mips ;;
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      powerpc-*-netbsd*) machine=macppc ;;
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      sparc*-*-netbsd*)	machine=sparc ;;
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      vax-*-netbsd*)	machine=vax ;;
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      arm-*-netbsd*)	machine=arm ;;
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      x86_64-*-netbsd*)	machine=amdx86-64 ;;
      hppa-*-netbsd*)	machine=hp800 ;;
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      m68k-*-netbsd*)	machine=m68k ;;
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    esac
  ;;

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  ## OpenBSD ports
  *-*-openbsd* )
    opsys=openbsd
    case "${canonical}" in
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      alpha*-*-openbsd*)	machine=alpha ;;
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      arm-*-openbsd*)          machine=arm ;;
      i386-*-openbsd*)         machine=intel386 ;;
      powerpc-*-openbsd*)      machine=macppc ;;
      sparc*-*-openbsd*)       machine=sparc ;;
      vax-*-openbsd*)          machine=vax ;;
      x86_64-*-openbsd*)       machine=amdx86-64 ;;
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      hppa-*-openbsd*)         machine=hp800 ;;
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    esac
  ;;

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  alpha*-*-linux-gnu* )
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    machine=alpha opsys=gnu-linux
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  ;;

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  arm*-*-linux-gnu* )
    machine=arm opsys=gnu-linux
  ;;

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  ## Apple Darwin / Mac OS X
  *-apple-darwin* )
    case "${canonical}" in
      i[3456]86-* )  machine=intel386 ;;
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      powerpc-* )    machine=macppc ;;
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      x86_64-* )     machine=amdx86-64 ;;
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      * )            unported=yes ;;
    esac
    opsys=darwin
    # Define CPP as follows to make autoconf work correctly.
    CPP="${CC-cc} -E -no-cpp-precomp"
    # Use fink packages if available.
    if test -d /sw/include && test -d /sw/lib; then
      GCC_TEST_OPTIONS="-I/sw/include -L/sw/lib"
      CPP="${CPP} ${GCC_TEST_OPTIONS}"
      NON_GCC_TEST_OPTIONS=${GCC_TEST_OPTIONS}
    fi
  ;;

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  ## HP 9000 series 700 and 800, running HP/UX
  hppa*-hp-hpux10.2* )
    machine=hp800 opsys=hpux10-20
  ;;
  hppa*-hp-hpux1[1-9]* )
    machine=hp800 opsys=hpux11
    CFLAGS="-D_INCLUDE__STDC_A1_SOURCE $CFLAGS"
  ;;

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  hppa*-*-linux-gnu* )
    machine=hp800 opsys=gnu-linux
  ;;

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  ## IBM machines
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  s390-*-linux-gnu* )
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    machine=ibms390 opsys=gnu-linux
  ;;
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  s390x-*-linux-gnu* )
    machine=ibms390x opsys=gnu-linux
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  ;;
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  rs6000-ibm-aix4.2* | powerpc-ibm-aix4.2*  )
    machine=ibmrs6000 opsys=aix4-2
  ;;
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  rs6000-ibm-aix4.3* | powerpc-ibm-aix4.3*  )
    machine=ibmrs6000 opsys=aix4-2
  ;;
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  rs6000-ibm-aix5* | powerpc-ibm-aix5*  )
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    machine=ibmrs6000 opsys=aix4-2
  ;;
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  rs6000-ibm-aix6* | powerpc-ibm-aix6*  )
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    machine=ibmrs6000 opsys=aix4-2
  ;;
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  ## Macintosh PowerPC
  powerpc*-*-linux-gnu* )
    machine=macppc opsys=gnu-linux
  ;;

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  ## Silicon Graphics machines
  ## Iris 4D
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  mips-sgi-irix6.5 )
    machine=iris4d 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_GNU_CPP="/lib/cpp -D_LANGUAGE_C"
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    NON_GCC_TEST_OPTIONS="-D_LANGUAGE_C"
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  ;;
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  ## Suns
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  sparc-*-linux-gnu* | sparc64-*-linux-gnu* )
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    machine=sparc opsys=gnu-linux
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  ;;

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  *-sun-solaris* \
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    | i[3456]86-*-solaris2* | i[3456]86-*-sunos5* \
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    | x86_64-*-solaris2*    | x86_64-*-sunos5*)
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    case "${canonical}" in
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      i[3456]86-*-* )     machine=intel386 ;;
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      amd64-*-*|x86_64-*-*)	machine=amdx86-64 ;;
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      sparc* )		machine=sparc ;;
      * )		unported=yes ;;
    esac
    case "${canonical}" in
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      *-sunos5.6* | *-solaris2.6* )
		opsys=sol2-6
		NON_GNU_CPP=/usr/ccs/lib/cpp
		RANLIB="ar -ts"
		;;
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      *-sunos5.[7-9]* | *-solaris2.[7-9]* )
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		opsys=sol2-6
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		emacs_check_sunpro_c=yes
		NON_GNU_CPP=/usr/ccs/lib/cpp
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		;;
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      *-sunos5* | *-solaris* )
		opsys=sol2-10
		emacs_check_sunpro_c=yes
		NON_GNU_CPP=/usr/ccs/lib/cpp
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		;;
    esac
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    ## 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
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  ;;

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  ## IA-64
  ia64*-*-linux* )
    machine=ia64 opsys=gnu-linux
  ;;

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  ## Intel 386 machines where we don't care about the manufacturer
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  i[3456]86-*-* )
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    machine=intel386
    case "${canonical}" in
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      *-cygwin )                opsys=cygwin ;;
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      *-darwin* )               opsys=darwin
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                                CPP="${CC-cc} -E -no-cpp-precomp"
 				;;
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      *-linux-gnu* )		opsys=gnu-linux ;;
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      *-sysv4.2uw* )	  	opsys=unixware; NON_GNU_CPP=/lib/cpp ;;
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      *-sysv5uw* )	  	opsys=unixware; NON_GNU_CPP=/lib/cpp ;;
      *-sysv5OpenUNIX* )  	opsys=unixware; NON_GNU_CPP=/lib/cpp ;;
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      ## Otherwise, we'll fall through to the generic opsys code at the bottom.
    esac
  ;;

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  ## m68k Linux-based GNU system
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  m68k-*-linux-gnu* )
    machine=m68k opsys=gnu-linux
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  ;;

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  ## Mips Linux-based GNU system
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  mips-*-linux-gnu* | mipsel-*-linux-gnu* \
    | mips64-*-linux-gnu* | mips64el-*-linux-gnu* )
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    machine=mips opsys=gnu-linux
  ;;

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  ## AMD x86-64 Linux-based GNU system
  x86_64-*-linux-gnu* )
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    machine=amdx86-64 opsys=gnu-linux
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  ;;

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  ## Tensilica Xtensa Linux-based GNU system
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  xtensa*-*-linux-gnu* )
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    machine=xtensa opsys=gnu-linux
    ;;

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  ## SuperH Linux-based GNU system
  sh[34]*-*-linux-gnu* )
    machine=sh3 opsys=gnu-linux
  ;;

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  * )
    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

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

machfile="m/${machine}.h"
opsysfile="s/${opsys}.h"


#### Choose a compiler.
test -n "$CC" && cc_specified=yes

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# Save the value of CFLAGS that the user specified.
SPECIFIED_CFLAGS="$CFLAGS"

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dnl Sets GCC=yes if using gcc.
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AC_PROG_CC
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# On Suns, sometimes $CPP names a directory.
if test -n "$CPP" && test -d "$CPP"; then
  CPP=
fi

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## If not using gcc, and on Solaris, and no CPP specified, see if
## using a Sun compiler, which needs -Xs to prevent whitespace.
if test x"$GCC" != xyes && test x"$emacs_check_sunpro_c" = xyes && \
 test x"$CPP" = x; then
  AC_MSG_CHECKING([whether we are using a Sun C compiler])
  AC_CACHE_VAL(emacs_cv_sunpro_c,
  [AC_TRY_LINK([],
[#ifndef __SUNPRO_C
fail;
#endif
], emacs_cv_sunpro_c=yes, emacs_cv_sunpro_c=no)])
  AC_MSG_RESULT($emacs_cv_sunpro_c)

  if test x"$emacs_cv_sunpro_c" = xyes; then
    NON_GNU_CPP="$CC -E -Xs"
  fi
fi

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#### Some systems specify a CPP to use unless we are using GCC.
#### Now that we know whether we are using GCC, we can decide whether
#### to use that one.
if test "x$NON_GNU_CPP" != x && test x$GCC != xyes && test "x$CPP" = x
then
  CPP="$NON_GNU_CPP"
fi

#### Some systems specify a CC to use unless we are using GCC.
#### Now that we know whether we are using GCC, we can decide whether
#### to use that one.
if test "x$NON_GNU_CC" != x && test x$GCC != xyes &&
  test x$cc_specified != xyes
then
  CC="$NON_GNU_CC"
fi

if test x$GCC = xyes && test "x$GCC_TEST_OPTIONS" != x
then
  CC="$CC $GCC_TEST_OPTIONS"
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fi
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if test x$GCC = x && test "x$NON_GCC_TEST_OPTIONS" != x
then
  CC="$CC $NON_GCC_TEST_OPTIONS"
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fi
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dnl checks for Unix variants
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AC_USE_SYSTEM_EXTENSIONS
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### Use -Wno-pointer-sign if the compiler supports it
AC_MSG_CHECKING([whether gcc understands -Wno-pointer-sign])
SAVE_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wno-pointer-sign"
AC_TRY_COMPILE([], [], has_option=yes, has_option=no,)
if test $has_option = yes; then
   C_WARNINGS_SWITCH="-Wno-pointer-sign $C_WARNINGS_SWITCH"
fi
AC_MSG_RESULT($has_option)
CFLAGS="$SAVE_CFLAGS"
unset has_option
unset SAVE_CFLAGS

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### Use -Wdeclaration-after-statement if the compiler supports it
AC_MSG_CHECKING([whether gcc understands -Wdeclaration-after-statement])
SAVE_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wdeclaration-after-statement"
AC_TRY_COMPILE([], [], has_option=yes, has_option=no,)
if test $has_option = yes; then
   C_WARNINGS_SWITCH="-Wdeclaration-after-statement $C_WARNINGS_SWITCH"
fi
AC_MSG_RESULT($has_option)
CFLAGS="$SAVE_CFLAGS"
unset has_option
unset SAVE_CFLAGS

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#### Some other nice autoconf tests.
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dnl checks for programs
AC_PROG_CPP
AC_PROG_INSTALL
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if test "x$RANLIB" = x; then
  AC_PROG_RANLIB
fi
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## Although we're running on an amd64 kernel, we're actually compiling for
## the x86 architecture.  The user should probably have provided an
## explicit --build to `configure', but if everything else than the kernel
## is running in i386 mode, we can help them out.
if test "$machine" = "amdx86-64"; then
  AC_CHECK_DECL([i386])
  if test "$ac_cv_have_decl_i386" = "yes"; then
    canonical=`echo "$canonical" | sed -e 's/^amd64/i386/' -e 's/^x86_64/i386/'`
    machine=intel386
    machfile="m/${machine}.h"
  fi
fi

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AC_PATH_PROG(INSTALL_INFO, install-info)
AC_PATH_PROG(INSTALL_INFO, install-info,, /usr/sbin)
AC_PATH_PROG(INSTALL_INFO, install-info,:, /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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## Need makeinfo >= 4.6 (?) to build the manuals.
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AC_PATH_PROG(MAKEINFO, makeinfo, no)
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dnl By this stage, configure has already checked for egrep and set EGREP,
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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\.[[6-9]]|4\.[[1-5]][[0-9]]+)'`" = x; then
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   MAKEINFO=no
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fi

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## 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).
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## In a Bazaar checkout on the other hand, the manuals are not included.
## So makeinfo is a requirement to build from Bazaar, and configure
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## should test for it as it does for any other build requirement.
## We use the presence of $srcdir/info/emacs to distinguish a release,
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## with pre-built manuals, from a Bazaar checkout.
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if test "$MAKEINFO" = "no"; then
  if test "x${with_makeinfo}" = "xno"; then
    MAKEINFO=off
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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 >= 4.6, and your
source tree does not seem to have pre-built manuals in the `info' directory.
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Either install a suitable version of makeinfo, or re-run configure
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with the `--without-makeinfo' option to build without the manuals.] )
  fi
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fi
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dnl Add our options to ac_link now, after it is set up.

if test x$GCC = xyes && test "x$GCC_LINK_TEST_OPTIONS" != x
then
  ac_link="$ac_link $GCC_LINK_TEST_OPTIONS"
fi

if test x$GCC = x && test "x$NON_GCC_LINK_TEST_OPTIONS" != x
then
  ac_link="$ac_link $NON_GCC_LINK_TEST_OPTIONS"
fi

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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.)
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dnl Treat GCC specially since it just gives a non-fatal `unrecognized option'
dnl if not built to support GNU ld.

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late_LDFLAGS=$LDFLAGS
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if test "$GCC" = yes; then
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  LDFLAGS="$LDFLAGS -Wl,-znocombreloc"
else
  LDFLAGS="$LDFLAGS -znocombreloc"
fi
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AC_MSG_CHECKING([for -znocombreloc])
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AC_LINK_IFELSE([main(){return 0;}],
  [AC_MSG_RESULT(yes)],
  LDFLAGS=$late_LDFLAGS
  [AC_MSG_RESULT(no)])

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#### Extract some information from the operating system and machine files.

AC_CHECKING([the machine- and system-dependent files to find out
 - which libraries the lib-src programs will want, and
 - whether the GNU malloc routines are usable])

### First figure out CFLAGS (which we use for running the compiler here)
### and REAL_CFLAGS (which we use for real compilation).
### The two are the same except on a few systems, where they are made
### different to work around various lossages.  For example,
### GCC 2.5 on GNU/Linux needs them to be different because it treats -g
### as implying static linking.

### If the CFLAGS env var is specified, we use that value
### instead of the default.

### It's not important that this name contain the PID; you can't run
### two configures in the same directory and have anything work
### anyway.
tempcname="conftest.c"

echo '
#include "'${srcdir}'/src/'${opsysfile}'"
#include "'${srcdir}'/src/'${machfile}'"

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configure___ LIBX=-lX11
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configure___ unexec=UNEXEC

#ifdef SYSTEM_MALLOC
configure___ system_malloc=yes
#else
configure___ system_malloc=no
#endif

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#ifdef USE_MMAP_FOR_BUFFERS
configure___ use_mmap_for_buffers=yes
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#else
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configure___ use_mmap_for_buffers=no
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#endif

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#ifndef C_OPTIMIZE_SWITCH
#ifdef __GNUC__
#define C_OPTIMIZE_SWITCH -O2
#else
#define C_OPTIMIZE_SWITCH -O
#endif
#endif

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#ifndef C_WARNINGS_SWITCH
#define C_WARNINGS_SWITCH ${C_WARNINGS_SWITCH}
#endif

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#ifdef THIS_IS_CONFIGURE

/* Get the CFLAGS for tests in configure.  */
#ifdef __GNUC__
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configure___ CFLAGS=-g C_OPTIMIZE_SWITCH '${SPECIFIED_CFLAGS}'
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#else
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configure___ CFLAGS='${SPECIFIED_CFLAGS}'
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#endif

#else /* not THIS_IS_CONFIGURE */

/* Get the CFLAGS for real compilation.  */
#ifdef __GNUC__
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configure___ REAL_CFLAGS=-g C_OPTIMIZE_SWITCH C_WARNINGS_SWITCH ${PROFILING_CFLAGS} '${SPECIFIED_CFLAGS}'
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#else
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configure___ REAL_CFLAGS='${SPECIFIED_CFLAGS}'
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#endif

#endif /* not THIS_IS_CONFIGURE */
' > ${tempcname}

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LDFLAGS="${LDFLAGS} ${PROFILING_LDFLAGS}"

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# The value of CPP is a quoted variable reference, so we need to do this
# to get its actual value...
CPP=`eval "echo $CPP"`
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[eval `${CPP} -Isrc ${tempcname} \
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       | sed -n -e 's/^configure___ \([^=]*=\)\(.*\)$/\1"\2"/p'`
if test "x$SPECIFIED_CFLAGS" = x; then
  eval `${CPP} -Isrc -DTHIS_IS_CONFIGURE ${tempcname} \
	 | sed -n -e 's/^configure___ \([^=]*=\)\(.*\)$/\1"\2"/p'`
else
  REAL_CFLAGS="$CFLAGS"
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fi]
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rm ${tempcname}

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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.
   LD_SWITCH_SYSTEM=-L/usr/local/lib
   ;;

  gnu-linux)
   ## cpp test was "ifdef __mips__", but presumably this is equivalent...
   test "$machine" = "mips" && LD_SWITCH_SYSTEM="-G 0"
   ;;

  netbsd)
   LD_SWITCH_SYSTEM="-Wl,-rpath,/usr/pkg/lib -L/usr/pkg/lib -Wl,-rpath,/usr/local/lib -L/usr/local/lib"
   ;;

  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"

## This is fun.  Some settings of LD_SWITCH_SYSTEM reference
## LD_SWITCH_X_SITE_AUX, which has not been defined yet.  When using
## cpp, it was expanded to null.  Thus LD_SWITCH_SYSTEM had different
## values in configure and the Makefiles.  How helpful.
## FIXME why not use LD_SWITCH_SYSTEM_TEMACS (or somesuch) instead?
case "$opsys" in
  gnu-linux)
   ## LD_SWITCH_X_SITE_AUX is a -R option saying where to find X at run-time.
   LD_SWITCH_SYSTEM="$LD_SWITCH_SYSTEM \$(LD_SWITCH_X_SITE_AUX)" ;;

  netbsd|openbsd)
   ## _AUX_RPATH is like _AUX, but uses -rpath instead of -R.
   LD_SWITCH_SYSTEM="\$(LD_SWITCH_X_SITE_AUX_RPATH) $LD_SWITCH_SYSTEM" ;;
esac
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C_SWITCH_MACHINE=
if test "$machine" = "alpha"; then
  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
  fi
fi
AC_SUBST(C_SWITCH_MACHINE)


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)


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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" ;;

  sol2*) LIBS_SYSTEM="-lsocket -lnsl -lkstat" ;;

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


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

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

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dnl For AC_FUNC_GETLOADAVG, at least:
AC_CONFIG_LIBOBJ_DIR(src)

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dnl Do this early because it can frob feature test macros for Unix-98 &c.
AC_SYS_LARGEFILE

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## If user specified a crt-dir, use that unconditionally.
if test "X$CRT_DIR" = "X"; then
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  case "$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

  ## Default is /usr/lib.
  test "X$CRT_DIR" = "X" && CRT_DIR=/usr/lib

else

  ## Some platforms don't use any of these files, so it is not
  ## appropriate to put this test outside the if block.
  test -e $CRT_DIR/crtn.o || test -e $CRT_DIR/crt0.o || \
    AC_MSG_ERROR([crt*.o not found in specified location.])

fi
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AC_SUBST(CRT_DIR)

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LIB_MATH=-lm
LIB_STANDARD=
START_FILES=

case $opsys in
  cygwin )
    LIB_MATH=
    START_FILES='ecrt0.o'
    ;;
  darwin )
    ## Adding -lm confuses the dynamic linker, so omit it.
    LIB_MATH=
    START_FILES='pre-crt0.o'
    ;;
  freebsd )
    LIB_STANDARD='-lgcc -lc -lgcc $(CRT_DIR)/crtend.o $(CRT_DIR)/crtn.o'
    START_FILES='pre-crt0.o $(CRT_DIR)/crt1.o $(CRT_DIR)/crti.o $(CRT_DIR)/crtbegin.o'
    ;;
  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'
    ;;
  netbsd | openbsd )
    if test -f $(CRT_DIR)/crti.o; then
	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'
    else
	LIB_STANDARD='-lgcc -lc -lgcc $(CRT_DIR)/crtend.o'
	START_FILES='pre-crt0.o $(CRT_DIR)/crt0.o $(CRT_DIR)/crtbegin.o'
    fi
    ;;
esac

AC_SUBST(LIB_MATH)
AC_SUBST(START_FILES)
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dnl This function definition taken from Gnome 2.0
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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

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  AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
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  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; then
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            AC_MSG_RESULT(yes)
            succeeded=yes

            AC_MSG_CHECKING($1_CFLAGS)
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            $1_CFLAGS=`$PKG_CONFIG --cflags "$2"|sed -e 's,///*,/,g'`
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            AC_MSG_RESULT($$1_CFLAGS)

            AC_MSG_CHECKING($1_LIBS)
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            $1_LIBS=`$PKG_CONFIG --libs "$2"|sed -e 's,///*,/,g'`
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            AC_MSG_RESULT($$1_LIBS)
        else
            AC_MSG_RESULT(no)
            $1_CFLAGS=""
            $1_LIBS=""
            ## If we have a custom action on failure, don't print errors, but
            ## do set a variable so people can do so.
            $1_PKG_ERRORS=`$PKG_CONFIG --errors-to-stdout --print-errors "$2"`
            ifelse([$4], ,echo $$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
])


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if test "${with_sound}" != "no"; then
  # Sound support for GNU/Linux and the free BSDs.
  AC_CHECK_HEADERS(machine/soundcard.h sys/soundcard.h soundcard.h)
  # Emulation library used on NetBSD.
  AC_CHECK_LIB(ossaudio, _oss_ioctl, LIBSOUND=-lossaudio, LIBSOUND=)
  AC_SUBST(LIBSOUND)
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  ALSA_REQUIRED=1.0.0
  ALSA_MODULES="alsa >= $ALSA_REQUIRED"
  PKG_CHECK_MODULES(ALSA, $ALSA_MODULES, HAVE_ALSA=yes, HAVE_ALSA=no)
  if test $HAVE_ALSA = yes; then
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    SAVE_CFLAGS="$CFLAGS"
    SAVE_LDFLAGS="$LDFLAGS"
    CFLAGS="$ALSA_CFLAGS $CFLAGS"
    LDFLAGS="$ALSA_LIBS $LDFLAGS"
    AC_TRY_COMPILE([#include <asoundlib.h>], [snd_lib_error_set_handler (0);],
                    emacs_alsa_normal=yes,
	            emacs_alsa_normal=no)
    if test "$emacs_alsa_normal" != yes; then
      AC_TRY_COMPILE([#include <alsa/asoundlib.h>],
                     [snd_lib_error_set_handler (0);],
                     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="$SAVE_CFLAGS"
    LDFLAGS="$SAVE_LDFLAGS"
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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
  AC_SUBST(CFLAGS_SOUND)
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fi
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dnl checks for header files
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AC_CHECK_HEADERS(sys/select.h sys/timeb.h sys/time.h unistd.h utime.h \
  linux/version.h sys/systeminfo.h termios.h limits.h string.h stdlib.h \
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  stdio_ext.h fcntl.h strings.h coff.h pty.h sys/mman.h \
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  sys/param.h sys/vlimit.h sys/resource.h locale.h sys/_mbstate_t.h \
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  sys/utsname.h pwd.h utmp.h)
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