nano/m4/gettext.m4

# gettext.m4 serial 14 (gettext-0.11.2)
dnl Copyright (C) 1995-2002 Free Software Foundation, Inc.
dnl This file is free software, distributed under the terms of the GNU
dnl General Public License.  As a special exception to the GNU General
dnl Public License, this file may be distributed as part of a program
dnl that contains a configuration script generated by Autoconf, under
dnl the same distribution terms as the rest of that program.
dnl
dnl This file can can be used in projects which are not available under
dnl the GNU General Public License or the GNU Library General Public
dnl License but which still want to provide support for the GNU gettext
dnl functionality.
dnl Please note that the actual code of the GNU gettext library is covered
dnl by the GNU Library General Public License, and the rest of the GNU
dnl gettext package package is covered by the GNU General Public License.
dnl They are *not* in the public domain.

dnl Authors:
dnl   Ulrich Drepper <drepper@cygnus.com>, 1995-2000.
dnl   Bruno Haible <haible@clisp.cons.org>, 2000-2002.

dnl Macro to add for using GNU gettext.

dnl Usage: AM_GNU_GETTEXT([INTLSYMBOL], [NEEDSYMBOL], [INTLDIR]).
dnl INTLSYMBOL can be one of 'external', 'no-libtool', 'use-libtool'. The
dnl    default (if it is not specified or empty) is 'no-libtool'.
dnl    INTLSYMBOL should be 'external' for packages with no intl directory,
dnl    and 'no-libtool' or 'use-libtool' for packages with an intl directory.
dnl    If INTLSYMBOL is 'use-libtool', then a libtool library
dnl    $(top_builddir)/intl/libintl.la will be created (shared and/or static,
dnl    depending on --{enable,disable}-{shared,static} and on the presence of
dnl    AM-DISABLE-SHARED). If INTLSYMBOL is 'no-libtool', a static library
dnl    $(top_builddir)/intl/libintl.a will be created.
dnl If NEEDSYMBOL is specified and is 'need-ngettext', then GNU gettext
dnl    implementations (in libc or libintl) without the ngettext() function
dnl    will be ignored.
dnl INTLDIR is used to find the intl libraries.  If empty,
dnl    the value `$(top_builddir)/intl/' is used.
dnl
dnl The result of the configuration is one of three cases:
dnl 1) GNU gettext, as included in the intl subdirectory, will be compiled
dnl    and used.
dnl    Catalog format: GNU --> install in $(datadir)
dnl    Catalog extension: .mo after installation, .gmo in source tree
dnl 2) GNU gettext has been found in the system's C library.
dnl    Catalog format: GNU --> install in $(datadir)
dnl    Catalog extension: .mo after installation, .gmo in source tree
dnl 3) No internationalization, always use English msgid.
dnl    Catalog format: none
dnl    Catalog extension: none
dnl If INTLSYMBOL is 'external', only cases 2 and 3 can occur.
dnl The use of .gmo is historical (it was needed to avoid overwriting the
dnl GNU format catalogs when building on a platform with an X/Open gettext),
dnl but we keep it in order not to force irrelevant filename changes on the
dnl maintainers.
dnl
AC_DEFUN([AM_GNU_GETTEXT],
[
  dnl Argument checking.
  ifelse([$1], [], , [ifelse([$1], [external], , [ifelse([$1], [no-libtool], , [ifelse([$1], [use-libtool], ,
    [errprint([ERROR: invalid first argument to AM_GNU_GETTEXT
])])])])])
  ifelse([$2], [], , [ifelse([$2], [need-ngettext], ,
    [errprint([ERROR: invalid second argument to AM_GNU_GETTEXT
])])])
  define(gt_included_intl, ifelse([$1], [external], [no], [yes]))
  define(gt_libtool_suffix_prefix, ifelse([$1], [use-libtool], [l], []))

  AC_REQUIRE([AM_PO_SUBDIRS])dnl
  ifelse(gt_included_intl, yes, [
    AC_REQUIRE([AM_INTL_SUBDIR])dnl
  ])

  dnl Prerequisites of AC_LIB_LINKFLAGS_BODY.
  AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
  AC_REQUIRE([AC_LIB_RPATH])

  AC_MSG_CHECKING([whether NLS is requested])
  dnl Default is enabled NLS
  AC_ARG_ENABLE(nls,
    [  --disable-nls           do not use Native Language Support],
    USE_NLS=$enableval, USE_NLS=yes)
  AC_MSG_RESULT($USE_NLS)
  AC_SUBST(USE_NLS)

  ifelse(gt_included_intl, yes, [
    BUILD_INCLUDED_LIBINTL=no
    USE_INCLUDED_LIBINTL=no
  ])
  LIBINTL=
  LTLIBINTL=
  POSUB=

  dnl If we use NLS figure out what method
  if test "$USE_NLS" = "yes"; then
    gt_use_preinstalled_gnugettext=no
    ifelse(gt_included_intl, yes, [
      AC_MSG_CHECKING([whether included gettext is requested])
      AC_ARG_WITH(included-gettext,
        [  --with-included-gettext use the GNU gettext library included here],
        nls_cv_force_use_gnu_gettext=$withval,
        nls_cv_force_use_gnu_gettext=no)
      AC_MSG_RESULT($nls_cv_force_use_gnu_gettext)

      nls_cv_use_gnu_gettext="$nls_cv_force_use_gnu_gettext"
      if test "$nls_cv_force_use_gnu_gettext" != "yes"; then
    ])
        dnl User does not insist on using GNU NLS library.  Figure out what
        dnl to use.  If GNU gettext is available we use this.  Else we have
        dnl to fall back to GNU NLS library.

        dnl Add a version number to the cache macros.
        define([gt_api_version], ifelse([$2], [need-ngettext], 2, 1))
        define([gt_cv_func_gnugettext_libc], [gt_cv_func_gnugettext]gt_api_version[_libc])
        define([gt_cv_func_gnugettext_libintl], [gt_cv_func_gnugettext]gt_api_version[_libintl])

        AC_CACHE_CHECK([for GNU gettext in libc], gt_cv_func_gnugettext_libc,
         [AC_TRY_LINK([#include <libintl.h>
extern int _nl_msg_cat_cntr;
extern int *_nl_domain_bindings;],
            [bindtextdomain ("", "");
return (int) gettext ("")]ifelse([$2], [need-ngettext], [ + (int) ngettext ("", "", 0)], [])[ + _nl_msg_cat_cntr + *_nl_domain_bindings],
            gt_cv_func_gnugettext_libc=yes,
            gt_cv_func_gnugettext_libc=no)])

        if test "$gt_cv_func_gnugettext_libc" != "yes"; then
          dnl Sometimes libintl requires libiconv, so first search for libiconv.
          ifelse(gt_included_intl, yes, , [
            AM_ICONV_LINK
          ])
          dnl Search for libintl and define LIBINTL, LTLIBINTL and INCINTL
          dnl accordingly. Don't use AC_LIB_LINKFLAGS_BODY([intl],[iconv])
          dnl because that would add "-liconv" to LIBINTL and LTLIBINTL
          dnl even if libiconv doesn't exist.
          AC_LIB_LINKFLAGS_BODY([intl])
          AC_CACHE_CHECK([for GNU gettext in libintl],
            gt_cv_func_gnugettext_libintl,
           [gt_save_CPPFLAGS="$CPPFLAGS"
            CPPFLAGS="$CPPFLAGS $INCINTL"
            gt_save_LIBS="$LIBS"
            LIBS="$LIBS $LIBINTL"
            dnl Now see whether libintl exists and does not depend on libiconv.
            AC_TRY_LINK([#include <libintl.h>
extern int _nl_msg_cat_cntr;
extern
#ifdef __cplusplus
"C"
#endif
const char *_nl_expand_alias ();],
              [bindtextdomain ("", "");
return (int) gettext ("")]ifelse([$2], [need-ngettext], [ + (int) ngettext ("", "", 0)], [])[ + _nl_msg_cat_cntr + *_nl_expand_alias (0)],
              gt_cv_func_gnugettext_libintl=yes,
              gt_cv_func_gnugettext_libintl=no)
            dnl Now see whether libintl exists and depends on libiconv.
            if test "$gt_cv_func_gnugettext_libintl" != yes && test -n "$LIBICONV"; then
              LIBS="$LIBS $LIBICONV"
              AC_TRY_LINK([#include <libintl.h>
extern int _nl_msg_cat_cntr;
extern
#ifdef __cplusplus
"C"
#endif
const char *_nl_expand_alias ();],
                [bindtextdomain ("", "");
return (int) gettext ("")]ifelse([$2], [need-ngettext], [ + (int) ngettext ("", "", 0)], [])[ + _nl_msg_cat_cntr + *_nl_expand_alias (0)],
               [LIBINTL="$LIBINTL $LIBICONV"
                LTLIBINTL="$LTLIBINTL $LTLIBICONV"
                gt_cv_func_gnugettext_libintl=yes
               ])
            fi
            CPPFLAGS="$gt_save_CPPFLAGS"
            LIBS="$gt_save_LIBS"])
        fi

        dnl If an already present or preinstalled GNU gettext() is found,
        dnl use it.  But if this macro is used in GNU gettext, and GNU
        dnl gettext is already preinstalled in libintl, we update this
        dnl libintl.  (Cf. the install rule in intl/Makefile.in.)
        if test "$gt_cv_func_gnugettext_libc" = "yes" \
           || { test "$gt_cv_func_gnugettext_libintl" = "yes" \
                && test "$PACKAGE" != gettext; }; then
          gt_use_preinstalled_gnugettext=yes
        else
          dnl Reset the values set by searching for libintl.
          LIBINTL=
          LTLIBINTL=
          INCINTL=
        fi

    ifelse(gt_included_intl, yes, [
        if test "$gt_use_preinstalled_gnugettext" != "yes"; then
          dnl GNU gettext is not found in the C library.
          dnl Fall back on included GNU gettext library.
          nls_cv_use_gnu_gettext=yes
        fi
      fi

      if test "$nls_cv_use_gnu_gettext" = "yes"; then
        dnl Mark actions used to generate GNU NLS library.
        INTLOBJS="\$(GETTOBJS)"
        BUILD_INCLUDED_LIBINTL=yes
        USE_INCLUDED_LIBINTL=yes
        LIBINTL="ifelse([$3],[],\${top_builddir}/intl,[$3])/libintl.[]gt_libtool_suffix_prefix[]a $LIBICONV"
        LTLIBINTL="ifelse([$3],[],\${top_builddir}/intl,[$3])/libintl.[]gt_libtool_suffix_prefix[]a $LTLIBICONV"
        LIBS=`echo " $LIBS " | sed -e 's/ -lintl / /' -e 's/^ //' -e 's/ $//'`
      fi

      if test "$gt_use_preinstalled_gnugettext" = "yes" \
         || test "$nls_cv_use_gnu_gettext" = "yes"; then
        dnl Mark actions to use GNU gettext tools.
        CATOBJEXT=.gmo
      fi
    ])

    if test "$gt_use_preinstalled_gnugettext" = "yes" \
       || test "$nls_cv_use_gnu_gettext" = "yes"; then
      AC_DEFINE(ENABLE_NLS, 1,
        [Define to 1 if translation of program messages to the user's native language
   is requested.])
    else
      USE_NLS=no
    fi
  fi

  if test "$USE_NLS" = "yes"; then

    if test "$gt_use_preinstalled_gnugettext" = "yes"; then
      if test "$gt_cv_func_gnugettext_libintl" = "yes"; then
        AC_MSG_CHECKING([how to link with libintl])
        AC_MSG_RESULT([$LIBINTL])
        AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCINTL])
      fi

      dnl For backward compatibility. Some packages may be using this.
      AC_DEFINE(HAVE_GETTEXT, 1,
       [Define if the GNU gettext() function is already present or preinstalled.])
      AC_DEFINE(HAVE_DCGETTEXT, 1,
       [Define if the GNU dcgettext() function is already present or preinstalled.])
    fi

    dnl We need to process the po/ directory.
    POSUB=po
  fi

  ifelse(gt_included_intl, yes, [
    dnl If this is used in GNU gettext we have to set BUILD_INCLUDED_LIBINTL
    dnl to 'yes' because some of the testsuite requires it.
    if test "$PACKAGE" = gettext; then
      BUILD_INCLUDED_LIBINTL=yes
    fi

    dnl Make all variables we use known to autoconf.
    AC_SUBST(BUILD_INCLUDED_LIBINTL)
    AC_SUBST(USE_INCLUDED_LIBINTL)
    AC_SUBST(CATOBJEXT)
    AC_SUBST(INTLOBJS)

    dnl For backward compatibility. Some configure.ins may be using this.
    nls_cv_header_intl=
    nls_cv_header_libgt=

    dnl For backward compatibility. Some Makefiles may be using this.
    DATADIRNAME=share
    AC_SUBST(DATADIRNAME)

    dnl For backward compatibility. Some Makefiles may be using this.
    INSTOBJEXT=.mo
    AC_SUBST(INSTOBJEXT)

    dnl For backward compatibility. Some Makefiles may be using this.
    GENCAT=gencat
    AC_SUBST(GENCAT)

    dnl Enable libtool support if the surrounding package wishes it.
    INTL_LIBTOOL_SUFFIX_PREFIX=gt_libtool_suffix_prefix
    AC_SUBST(INTL_LIBTOOL_SUFFIX_PREFIX)
  ])

  dnl For backward compatibility. Some Makefiles may be using this.
  INTLLIBS="$LIBINTL"
  AC_SUBST(INTLLIBS)

  dnl Make all documented variables known to autoconf.
  AC_SUBST(LIBINTL)
  AC_SUBST(LTLIBINTL)
  AC_SUBST(POSUB)
])


dnl Checks for all prerequisites of the po subdirectory,
dnl except for USE_NLS.
AC_DEFUN([AM_PO_SUBDIRS],
[
  AC_REQUIRE([AC_PROG_MAKE_SET])dnl
  AC_REQUIRE([AC_PROG_INSTALL])dnl
  AC_REQUIRE([AM_MKINSTALLDIRS])dnl

  dnl Perform the following tests also if --disable-nls has been given,
  dnl because they are needed for "make dist" to work.

  dnl Search for GNU msgfmt in the PATH.
  dnl The first test excludes Solaris msgfmt and early GNU msgfmt versions.
  dnl The second test excludes FreeBSD msgfmt.
  AM_PATH_PROG_WITH_TEST(MSGFMT, msgfmt,
    [$ac_dir/$ac_word --statistics /dev/null >/dev/null 2>&1 &&
     (if $ac_dir/$ac_word --statistics /dev/null 2>&1 >/dev/null | grep usage >/dev/null; then exit 1; else exit 0; fi)],
    :)
  AC_PATH_PROG(GMSGFMT, gmsgfmt, $MSGFMT)

  dnl Search for GNU xgettext 0.11 or newer in the PATH.
  dnl The first test excludes Solaris xgettext and early GNU xgettext versions.
  dnl The second test excludes FreeBSD xgettext.
  AM_PATH_PROG_WITH_TEST(XGETTEXT, xgettext,
    [$ac_dir/$ac_word --omit-header --copyright-holder= /dev/null >/dev/null 2>&1 &&
     (if $ac_dir/$ac_word --omit-header --copyright-holder= /dev/null 2>&1 >/dev/null | grep usage >/dev/null; then exit 1; else exit 0; fi)],
    :)
  dnl Remove leftover from FreeBSD xgettext call.
  rm -f messages.po

  dnl Search for GNU msgmerge 0.11 or newer in the PATH.
  AM_PATH_PROG_WITH_TEST(MSGMERGE, msgmerge,
    [$ac_dir/$ac_word --update -q /dev/null /dev/null >/dev/null 2>&1], :)

  dnl This could go away some day; the PATH_PROG_WITH_TEST already does it.
  dnl Test whether we really found GNU msgfmt.
  if test "$GMSGFMT" != ":"; then
    dnl If it is no GNU msgfmt we define it as : so that the
    dnl Makefiles still can work.
    if $GMSGFMT --statistics /dev/null >/dev/null 2>&1 &&
       (if $GMSGFMT --statistics /dev/null 2>&1 >/dev/null | grep usage >/dev/null; then exit 1; else exit 0; fi); then
      : ;
    else
      GMSGFMT=`echo "$GMSGFMT" | sed -e 's,^.*/,,'`
      AC_MSG_RESULT(
        [found $GMSGFMT program is not GNU msgfmt; ignore it])
      GMSGFMT=":"
    fi
  fi

  dnl This could go away some day; the PATH_PROG_WITH_TEST already does it.
  dnl Test whether we really found GNU xgettext.
  if test "$XGETTEXT" != ":"; then
    dnl If it is no GNU xgettext we define it as : so that the
    dnl Makefiles still can work.
    if $XGETTEXT --omit-header --copyright-holder= /dev/null >/dev/null 2>&1 &&
       (if $XGETTEXT --omit-header --copyright-holder= /dev/null 2>&1 >/dev/null | grep usage >/dev/null; then exit 1; else exit 0; fi); then
      : ;
    else
      AC_MSG_RESULT(
        [found xgettext program is not GNU xgettext; ignore it])
      XGETTEXT=":"
    fi
    dnl Remove leftover from FreeBSD xgettext call.
    rm -f messages.po
  fi

  AC_OUTPUT_COMMANDS([
    for ac_file in $CONFIG_FILES; do
      # Support "outfile[:infile[:infile...]]"
      case "$ac_file" in
        *:*) ac_file=`echo "$ac_file"|sed 's%:.*%%'` ;;
      esac
      # PO directories have a Makefile.in generated from Makefile.in.in.
      case "$ac_file" in */Makefile.in)
        # Adjust a relative srcdir.
        ac_dir=`echo "$ac_file"|sed 's%/[^/][^/]*$%%'`
        ac_dir_suffix="/`echo "$ac_dir"|sed 's%^\./%%'`"
        ac_dots=`echo "$ac_dir_suffix"|sed 's%/[^/]*%../%g'`
        # In autoconf-2.13 it is called $ac_given_srcdir.
        # In autoconf-2.50 it is called $srcdir.
        test -n "$ac_given_srcdir" || ac_given_srcdir="$srcdir"
        case "$ac_given_srcdir" in
          .)  top_srcdir=`echo $ac_dots|sed 's%/$%%'` ;;
          /*) top_srcdir="$ac_given_srcdir" ;;
          *)  top_srcdir="$ac_dots$ac_given_srcdir" ;;
        esac
        if test -f "$ac_given_srcdir/$ac_dir/POTFILES.in"; then
          rm -f "$ac_dir/POTFILES"
          test -n "$as_me" && echo "$as_me: creating $ac_dir/POTFILES" || echo "creating $ac_dir/POTFILES"
          cat "$ac_given_srcdir/$ac_dir/POTFILES.in" | sed -e "/^#/d" -e "/^[ 	]*\$/d" -e "s,.*,     $top_srcdir/& \\\\," | sed -e "\$s/\(.*\) \\\\/\1/" > "$ac_dir/POTFILES"
          # ALL_LINGUAS, POFILES, GMOFILES, UPDATEPOFILES, DUMMYPOFILES depend
          # on $ac_dir but don't depend on user-specified configuration
          # parameters.
          if test -f "$ac_given_srcdir/$ac_dir/LINGUAS"; then
            # The LINGUAS file contains the set of available languages.
            if test -n "$ALL_LINGUAS"; then
              test -n "$as_me" && echo "$as_me: setting ALL_LINGUAS in configure.in is obsolete" || echo "setting ALL_LINGUAS in configure.in is obsolete"
            fi
            ALL_LINGUAS_=`sed -e "/^#/d" "$ac_given_srcdir/$ac_dir/LINGUAS"`
            # Hide the ALL_LINGUAS assigment from automake.
            eval 'ALL_LINGUAS''=$ALL_LINGUAS_'
          fi
          case "$ac_given_srcdir" in
            .) srcdirpre= ;;
            *) srcdirpre='$(srcdir)/' ;;
          esac
          POFILES=
          GMOFILES=
          UPDATEPOFILES=
          DUMMYPOFILES=
          for lang in $ALL_LINGUAS; do
            POFILES="$POFILES $srcdirpre$lang.po"
            GMOFILES="$GMOFILES $srcdirpre$lang.gmo"
            UPDATEPOFILES="$UPDATEPOFILES $lang.po-update"
            DUMMYPOFILES="$DUMMYPOFILES $lang.nop"
          done
          # CATALOGS depends on both $ac_dir and the user's LINGUAS
          # environment variable.
          INST_LINGUAS=
          if test -n "$ALL_LINGUAS"; then
            for presentlang in $ALL_LINGUAS; do
              useit=no
              if test "%UNSET%" != "$LINGUAS"; then
                desiredlanguages="$LINGUAS"
              else
                desiredlanguages="$ALL_LINGUAS"
              fi
              for desiredlang in $desiredlanguages; do
                # Use the presentlang catalog if desiredlang is
                #   a. equal to presentlang, or
                #   b. a variant of presentlang (because in this case,
                #      presentlang can be used as a fallback for messages
                #      which are not translated in the desiredlang catalog).
                case "$desiredlang" in
                  "$presentlang"*) useit=yes;;
                esac
              done
              if test $useit = yes; then
                INST_LINGUAS="$INST_LINGUAS $presentlang"
              fi
            done
          fi
          CATALOGS=
          if test -n "$INST_LINGUAS"; then
            for lang in $INST_LINGUAS; do
              CATALOGS="$CATALOGS $lang.gmo"
            done
          fi
          test -n "$as_me" && echo "$as_me: creating $ac_dir/Makefile" || echo "creating $ac_dir/Makefile"
          sed -e "/^POTFILES =/r $ac_dir/POTFILES" -e "/^# Makevars/r $ac_given_srcdir/$ac_dir/Makevars" -e "s|@POFILES@|$POFILES|g" -e "s|@GMOFILES@|$GMOFILES|g" -e "s|@UPDATEPOFILES@|$UPDATEPOFILES|g" -e "s|@DUMMYPOFILES@|$DUMMYPOFILES|g" -e "s|@CATALOGS@|$CATALOGS|g" "$ac_dir/Makefile.in" > "$ac_dir/Makefile"
          for f in "$ac_given_srcdir/$ac_dir"/Rules-*; do
            if test -f "$f"; then
              case "$f" in
                *.orig | *.bak | *~) ;;
                *) cat "$f" >> "$ac_dir/Makefile" ;;
              esac
            fi
          done
        fi
        ;;
      esac
    done],
   [# Capture the value of obsolete $ALL_LINGUAS because we need it to compute
    # POFILES, GMOFILES, UPDATEPOFILES, DUMMYPOFILES, CATALOGS. But hide it
    # from automake.
    eval 'ALL_LINGUAS''="$ALL_LINGUAS"'
    # Capture the value of LINGUAS because we need it to compute CATALOGS.
    LINGUAS="${LINGUAS-%UNSET%}"
   ])
])


dnl Checks for all prerequisites of the intl subdirectory,
dnl except for INTL_LIBTOOL_SUFFIX_PREFIX (and possibly LIBTOOL), INTLOBJS,
dnl            USE_INCLUDED_LIBINTL, BUILD_INCLUDED_LIBINTL.
AC_DEFUN([AM_INTL_SUBDIR],
[
  AC_REQUIRE([AC_PROG_INSTALL])dnl
  AC_REQUIRE([AM_MKINSTALLDIRS])dnl
  AC_REQUIRE([AC_PROG_CC])dnl
  AC_REQUIRE([AC_CANONICAL_HOST])dnl
  AC_REQUIRE([AC_PROG_RANLIB])dnl
  AC_REQUIRE([AC_ISC_POSIX])dnl
  AC_REQUIRE([AC_HEADER_STDC])dnl
  AC_REQUIRE([AC_C_CONST])dnl
  AC_REQUIRE([AC_C_INLINE])dnl
  AC_REQUIRE([AC_TYPE_OFF_T])dnl
  AC_REQUIRE([AC_TYPE_SIZE_T])dnl
  AC_REQUIRE([AC_FUNC_ALLOCA])dnl
  AC_REQUIRE([AC_FUNC_MMAP])dnl
  AC_REQUIRE([jm_GLIBC21])dnl

  AC_CHECK_HEADERS([argz.h limits.h locale.h nl_types.h malloc.h stddef.h \
stdlib.h string.h unistd.h sys/param.h])
  AC_CHECK_FUNCS([feof_unlocked fgets_unlocked getc_unlocked getcwd getegid \
geteuid getgid getuid mempcpy munmap putenv setenv setlocale stpcpy \
strcasecmp strdup strtoul tsearch __argz_count __argz_stringify __argz_next])

  AM_ICONV
  AM_LANGINFO_CODESET
  AM_LC_MESSAGES

  dnl intl/plural.c is generated from intl/plural.y. It requires bison,
  dnl because plural.y uses bison specific features. It requires at least
  dnl bison-1.26 because earlier versions generate a plural.c that doesn't
  dnl compile.
  dnl bison is only needed for the maintainer (who touches plural.y). But in
  dnl order to avoid separate Makefiles or --enable-maintainer-mode, we put
  dnl the rule in general Makefile. Now, some people carelessly touch the
  dnl files or have a broken "make" program, hence the plural.c rule will
  dnl sometimes fire. To avoid an error, defines BISON to ":" if it is not
  dnl present or too old.
  AC_CHECK_PROGS([INTLBISON], [bison])
  if test -z "$INTLBISON"; then
    ac_verc_fail=yes
  else
    dnl Found it, now check the version.
    AC_MSG_CHECKING([version of bison])
changequote(<<,>>)dnl
    ac_prog_version=`$INTLBISON --version 2>&1 | sed -n 's/^.*GNU Bison.* \([0-9]*\.[0-9.]*\).*$/\1/p'`
    case $ac_prog_version in
      '') ac_prog_version="v. ?.??, bad"; ac_verc_fail=yes;;
      1.2[6-9]* | 1.[3-9][0-9]* | [2-9].*)
changequote([,])dnl
         ac_prog_version="$ac_prog_version, ok"; ac_verc_fail=no;;
      *) ac_prog_version="$ac_prog_version, bad"; ac_verc_fail=yes;;
    esac
    AC_MSG_RESULT([$ac_prog_version])
  fi
  if test $ac_verc_fail = yes; then
    INTLBISON=:
  fi
])


AC_DEFUN([AM_MKINSTALLDIRS],
[
  dnl If the AC_CONFIG_AUX_DIR macro for autoconf is used we possibly
  dnl find the mkinstalldirs script in another subdir but $(top_srcdir).
  dnl Try to locate is.
  MKINSTALLDIRS=
  if test -n "$ac_aux_dir"; then
    MKINSTALLDIRS="$ac_aux_dir/mkinstalldirs"
  fi
  if test -z "$MKINSTALLDIRS"; then
    MKINSTALLDIRS="\$(top_srcdir)/mkinstalldirs"
  fi
  AC_SUBST(MKINSTALLDIRS)
])