configure.ac - texinfo - Git at Google

 # Process this file with autoconf to produce a configure script.
 #
 # Copyright 2002-2022 Free Software Foundation, Inc.
 #
 # This file is free software; as a special exception the author gives
 # unlimited permission to copy and/or distribute it, with or without
 # modifications, as long as this notice is preserved.
 #
 # This program is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 #
 AC_INIT([GNU Texinfo], [7.0.1], [bug-texinfo@gnu.org])

 dnl Must come before AM_INIT_AUTOMAKE.
 AC_CONFIG_AUX_DIR([build-aux])
 dnl tar-ustar because we have long filenames for some test files.
 dnl parallel-tests as recommended by stefano.
 AM_INIT_AUTOMAKE([1.14 dist-xz
                  info-in-builddir parallel-tests tar-ustar])

 # Where to generate output; srcdir location.
 AC_CONFIG_HEADERS([config.h:config.in])dnl Keep filename to 8.3 for MS-DOS.
 AC_CONFIG_SRCDIR([info/info.c])

 # TexinfoXML DTD (./util/texinfo.dtd) version:
 # manually set this to the next version number rather than
 # $PACKAGE_VERSION, as soon as the DTD is modified, and perhaps put the
 # file on the web, too.  Several reasons:
 # 1. To avoid using a DTD from the Internet that wouldn't be in sync;
 # 2. To avoid unnnecessary changes in XML output file headers, in
 #    test results for instance.
 # 3. It may be kept as is in case there were no change in the DTD
 #    between releases.  This is rare, but has happened.
 #
 TEXINFO_DTD_VERSION=7.0
 AC_SUBST([TEXINFO_DTD_VERSION])

 # Package date.
 PACKAGE_DATE=`${SHELL} "$srcdir"/build-aux/mdate-sh "$srcdir"/configure.ac`
 AC_SUBST([PACKAGE_DATE])

 # We need Perl
 AC_ARG_VAR([PERL], [The path to the 'perl' executable.])
 AC_PATH_PROG([PERL], [perl])
 if test -z "$PERL"; then
    AC_MSG_ERROR(
 [perl not found; Texinfo requires Perl.
 If you have perl installed somewhere not in PATH,
 specify where it is using
   ./configure PERL=/path/to/perl
 ])
 fi

 # User variables for a Perl XS extension, which may be different, for
 # example if the Perl interpreter being used was compiled with a
 # different compiler.  Also in tp/Texinfo/XS/configure.ac.
 AC_ARG_VAR([PERL_EXT_CFLAGS], [Compiler flags for a Perl extension])
 AC_ARG_VAR([PERL_EXT_CPPFLAGS], [C preprocessor flags for a Perl extension])
 AC_ARG_VAR([PERL_EXT_LDFLAGS], [Linker flags for a Perl extension])
 AC_ARG_VAR([PERL_EXT_CC], [Compiler for a Perl extension])

 AC_MSG_CHECKING([Perl version and modules])
 if $PERL -e "use 5.008_001; use Encode; use Data::Dumper" >/dev/null 2>&1; then
   perl_version_requirement='yes'
 else
   perl_version_requirement='no'
 fi
 AC_MSG_RESULT($perl_version_requirement)
 if test z"$perl_version_requirement" = 'zno' ; then
   AC_MSG_ERROR([perl >= 5.8.1 with Encode and Data::Dumper required by Texinfo.])
 fi


 AC_REQUIRE_AUX_FILE([tap-driver.sh])

 # Find awk for running texindex.
 # Don't use AC_PROG_AWK because this prefers gawk, which may be much
 # slower than the awk that the user has in their path (e.g. mawk).
 # We use AC_PATH_PROGS_FEATURE_CHECK to eliminate archaic versions of
 # awk that don't support user-defined functions.
 AC_CACHE_CHECK([for awk], [ac_cv_path_TI_AWK],
     [AC_PATH_PROGS_FEATURE_CHECK([TI_AWK], [awk gawk mawk nawk],
       [[$ac_path_TI_AWK 'function foo () {}' 2>/dev/null \
            && ac_cv_path_TI_AWK=$ac_path_TI_AWK ac_path_TI_AWK_found=:]],
       [AC_MSG_ERROR([awk not found])])])
 AC_SUBST([TI_AWK], [$ac_cv_path_TI_AWK])

 # for generating texindex.awk
 AM_MISSING_PROG(GAWK, gawk)

 # Checks for programs.
 AC_PROG_CC

 # Since we use gnulib: gl_EARLY must be called as soon as possible after
 # the C compiler is checked.  The others could be later, but we just
 # keep everything together.
 gl_EARLY

 # Rest of Gnulib.
 gl_INIT

 # To generate man pages.
 AM_MISSING_PROG(HELP2MAN, help2man)
 AM_MISSING_PROG(POD2MAN, pod2man)

 AC_PROG_INSTALL
 AC_PROG_MAKE_SET

 AC_PROG_LN_S
 AC_PROG_MKDIR_P

 # gettext Makefiles may still need MKINSTALLDIRS.
 MKINSTALLDIRS="\$(top_srcdir)/build-aux/install-sh -d"
 AC_SUBST([MKINSTALLDIRS])

 # check whether diff accepts the -u option (not on HP-UX).
 AC_MSG_CHECKING(whether diff accepts -u)
 diff_accepts_u_option=no
 echo foo >conftest.dtx
 echo foo | diff -u - conftest.dtx >/dev/null 2>&1
 error_status_diff_u=$?
 if test $error_status_diff_u = 0; then
   diff_accepts_u_option=yes
 fi
 AC_MSG_RESULT($diff_accepts_u_option)
 rm -f conftest.dtx

 DIFF_U_OPTION=
 if test "z$diff_accepts_u_option" = 'zyes' ; then
   DIFF_U_OPTION=-u
 fi
 AC_SUBST([DIFF_U_OPTION])

 # check whether diff accepts the -a option (only needed for GNU diff).
 AC_MSG_CHECKING(whether diff accepts -a)
 diff_accepts_a_option=no
 echo foo >conftest.dtx
 echo foo | diff -a - conftest.dtx >/dev/null 2>&1
 error_status_diff_a=$?
 if test $error_status_diff_a = 0; then
   diff_accepts_a_option=yes
 fi
 AC_MSG_RESULT($diff_accepts_a_option)
 rm -f conftest.dtx

 DIFF_A_OPTION=
 if test "z$diff_accepts_a_option" = 'zyes' ; then
   DIFF_A_OPTION=-a
 fi
 AC_SUBST([DIFF_A_OPTION])

 # Checks for header files.
 AC_CHECK_HEADERS(io.h pwd.h \
   termcap.h termios.h unistd.h \
   sys/ioctl.h sys/time.h sys/wait.h)

 AC_SYS_POSIX_TERMIOS

 AC_TYPE_OFF_T

 # Checks for library functions.
 AC_CHECK_FUNCS(setlocale sigaction sigprocmask posix_openpt)

 # Used for Info tests
 AM_CONDITIONAL([have_ptys], [test x$ac_cv_func_posix_openpt = xyes])

 # We want to recognize djgpp to avoid the useless warning about no
 # term library.
 AC_CANONICAL_BUILD

 # We need to run some of our own binaries, most notably makedoc, but as
 # long as we have this process, we also use our own makeinfo and
 # install-info.
 #
 # This means that if we are cross compiling, we have to configure the
 # package twice: once with the native compiler (this is done in a
 # subdirectory $native_tools), and once with the cross compiler.
 # The former is invoked automatically here, with --host=$build.
 # $native_tools is also added to SUBDIRS in the main Makefile.am,
 # so that make compiles the native tools first.
 #
 if test "$cross_compiling" = no; then
   native_tools=
 else
   native_tools=tools
   test -d "$native_tools" || mkdir "$native_tools"
   confdir=`(cd "$srcdir";pwd)`
   # Make sure the secondary configure won't fail with
   # "error: source directory already configured".
   rm -f config.status
   AC_MSG_NOTICE([[Doing configure of native tools (${build}).]])
   cd "$native_tools" || exit 1
   # Run secondary configure in alternate environment or
   # it gets the wrong CC etc.
   # env -i gives this build host configure a clean environment;
   # consequently, we have to re-initialize $PATH.
   env -i CC="$BUILD_CC" AR="$BUILD_AR" RANLIB="$BUILD_RANLIB" \
       PATH="$PATH" \
       tools_only=1 \
     ${confdir}/configure --build=${build} --host=${build} \
                          --disable-rpath --disable-nls
   cd .. || exit 1
   AC_MSG_NOTICE([[Continuing with main configure (${host}).]])
 fi
 AC_SUBST(native_tools)
 AM_CONDITIONAL(TOOLS_ONLY, [[test "x$tools_only" = x1]])

 # Some GNU/Linux systems (e.g., SuSE 4.3, 1996) don't have curses, but
 # rather ncurses.  So we check for it.
 TERMLIBS=
 # Check for termlib before termcap because Solaris termcap needs libucb.
 TERMLIB_VARIANTS="tinfo ncurses curses termlib termcap terminfo"
 for termlib in ${TERMLIB_VARIANTS}; do
   AC_CHECK_LIB(${termlib}, tgetent,
      [TERMLIBS="${TERMLIBS} -l${termlib}"; break])
 done
 have_termlib=yes
 # don't bother warning on djgpp and MinGW, they don't have a term library,
 # and port each termcap-needing program separately according to the needs.
 if test -z "$TERMLIBS" \
    && echo "$build" | grep -v djgpp | grep -v mingw >/dev/null; then
   AC_MSG_WARN([info needs a terminal library, one of: ${TERMLIB_VARIANTS}])
   have_termlib=no
 fi

 # Checks for variables.
 # HP-UX 9 (at least) needs -lncurses which defines termcap variables PC etc.
 AC_MSG_CHECKING(for library with termcap variables)
 AC_CACHE_VAL(ac_cv_var_ospeed,
 [oldLIBS=$LIBS
 for trylib in $termlib ${TERMLIB_VARIANTS}; do
    if test "x$trylib" != "x$termlib"; then
      LIBS="$oldLIBS -l$termlib -l$trylib"
    else
      LIBS="$oldLIBS -l$termlib"
    fi
    AC_LINK_IFELSE([AC_LANG_PROGRAM([], [[#ifdef HAVE_NCURSES_TERMCAP_H
 #include <ncurses/termcap.h>
 #else
 #ifdef HAVE_TERMCAP_H
 #include <termcap.h>
 #else
 #undef PC
 char *BC;
 char **UP;
 char PC;
 short ospeed;
 #endif
 #endif
 /* Make sure all variables actually exist.  AIX 4.3 has ospeed but no BC.
    --Andreas Ley <andy@rz.uni-karlsruhe.de> 24 Aug 2000.  */
 BC++;
 UP++;
 PC++;
 return ospeed != 0;
 ]])], [ac_cv_var_ospeed=$trylib; break])
 done
 LIBS=$oldLIBS
 ])
 AC_MSG_RESULT($ac_cv_var_ospeed)
 if test -n "$ac_cv_var_ospeed" \
    && test "x$termlib" != "x$ac_cv_var_ospeed"; then
   TERMLIBS="${TERMLIBS} -l${ac_cv_var_ospeed}"
 fi
 AC_SUBST(TERMLIBS)#
 AM_CONDITIONAL(HAVE_TERMLIBS, [[test "x$TERMLIBS" != x]])

 # Do not use <ncurses/termcap.h> unless we're linking with ncurses.
 # Must come after the termlib tests.
 if test "x$termlib" = xncurses; then
   # Use AC_CHECK_HEADERS so the HAVE_*_H symbol gets defined.
   AC_CHECK_HEADERS(ncurses/termcap.h)
 fi

 # For teTeX and TeX Live.
 AC_CANONICAL_HOST
 AC_ARG_ENABLE([multiplatform],
   [AS_HELP_STRING([--enable-multiplatform],
      [put executables into bin/PLATFORM and libraries into lib/PLATFORM])])dnl
 # if enable_multiplatform is set in the environment, use that.
 if test "x$enable_multiplatform" = xyes; then
   test "x$bindir" = 'x${exec_prefix}/bin' && bindir="$bindir/$host"
   test "x$libdir" = 'x${exec_prefix}/lib' && libdir="$libdir/$host"
 fi

 # Taken from the example in
 # http://www.gnu.org/software/automake/manual/html_node/Conditionals.html.
 AC_ARG_ENABLE(install-warnings,
   [  --disable-install-warnings  omit make install warnings about TeX files],
   [case "${enableval}" in
      yes) install_warnings=true ;;
       no) install_warnings=false ;;
        *) AC_MSG_ERROR(bad value ${enableval} for --enable-install-warnings) ;;
    esac],
    [install_warnings=true])
 AM_CONDITIONAL(INSTALL_WARNINGS,
    test x"$install_warnings" = xtrue || test x"$install_warnings" = xyes)

 USE_EXTERNAL_EASTASIANWIDTH=no
 AC_ARG_WITH([external-Unicode-EastAsianWidth],
    AS_HELP_STRING([--with-external-Unicode-EastAsianWidth],[use external Unicode-EastAsianWidth (default: no)]),
    [if test $withval = 'yes'; then
       USE_EXTERNAL_EASTASIANWIDTH=yes
    fi]
 )

 AC_SUBST([USE_EXTERNAL_EASTASIANWIDTH])

 USE_EXTERNAL_UNIDECODE=no
 AC_ARG_WITH([external-Text-Unidecode],
     AS_HELP_STRING([--with-external-Text-Unidecode],[use external Text::Unidecode (default: no)]),
    [if test $withval = 'yes'; then
       USE_EXTERNAL_UNIDECODE=yes
    fi]
 )

 AC_SUBST([USE_UNICODE])
 AC_SUBST([USE_EXTERNAL_UNIDECODE])

 # i18n support.  To update to a new version of gettext, run:
 #   gettextize -f --po-dir=po --po-dir=po_document
 # See http://gnu.org/s/gnulib/manual/html_node/gettextize-and-autopoint.html.
 AM_GNU_GETTEXT_VERSION([0.21])
 AM_GNU_GETTEXT([external])

 USE_EXTERNAL_LIBINTL=no
 AC_ARG_WITH([external-libintl-perl],
    AS_HELP_STRING([--with-external-libintl-perl],[use external libintl-perl (default: no)]),
    [if test $withval = 'yes'; then
       USE_EXTERNAL_LIBINTL=yes
    fi]
 )

 AC_SUBST([USE_EXTERNAL_LIBINTL])

 AC_ARG_ENABLE([perl-xs],
     AS_HELP_STRING([--enable-perl-xs],[build Perl XS modules for speed (default: check)]),
     [ enable_xs=$enableval],
     [ enable_xs=check])

 # Set xs_srcdir to the path from XS builddir to srcdir
 case $srcdir in
   .)  # We are building in place.
     xs_srcdir=../.. ;;
   [[\\/]]* | ?:[[\\/]]* )  # Absolute name.
     xs_srcdir=$srcdir/tp ;;
   *) # Relative name.
     xs_srcdir=../../../$srcdir/tp ;;
 esac

 # Pass on all the options we were given to the subsidiary configure
 # script.
 # Don't use AC_CONFIG_SUBDIRS for this because it isn't done right away,
 # and we need it for the check that follows.
 # We use the _AC_OUTPUT_SUBDIRS internal autoconf macro
 # (in /usr/share/autoconf/autoconf/status.m4) for this in order to
 # pass on the configure command line correctly; for example, adjusting
 # paths.  It is done in a subshell to be resilient against failure of the
 # subsidiary configure script, which happens if the C compiler is found
 # not to work.
 #
 save_subdirs=$subdirs
 subdirs=tp/Texinfo/XS
 ( _AC_OUTPUT_SUBDIRS ) || enable_xs=no
 subdirs=$save_subdirs

 if test $enable_xs = no; then
   AC_MSG_NOTICE([building Perl extension (XS) modules will be disabled])
 fi

 if test $enable_xs = check; then
   AC_MSG_CHECKING([whether we can build Perl extension (XS) modules])
   AC_MSG_RESULT([])
   enable_xs=no
   (cd tp/Texinfo/XS \
    && make clean \
    && make TestXS.la \
    && TEXINFO_XS=debug ; export TEXINFO_XS \
    && ${PERL} -I . \
               -I ${xs_srcdir} \
               -e 'require Texinfo::XS::TestXS;' \
       | grep 'message from XS module') \
   && enable_xs=yes
   AC_MSG_CHECKING([whether we can build Perl extension (XS) modules])
   AC_MSG_RESULT([$enable_xs])
 fi

 AC_SUBST([enable_xs])

 AM_CONDITIONAL([DISABLE_XS], [test "z$enable_xs" = zno])

 # Texinfo JS Interface
 npm_path="${srcdir}/js/node_modules/.bin${PATH_SEPARATOR}$PATH"

 AC_PATH_PROG([ESLINT], [eslint], [], [$npm_path])
 AM_CONDITIONAL([HAVE_ESLINT], [test "x$ac_cv_path_ESLINT" != "x"])

 AC_PATH_PROG([TSC], [tsc], [], [$npm_path])
 AM_CONDITIONAL([HAVE_TYPESCRIPT], [test "x$ac_cv_path_TSC" != "x"])

 AC_PATH_PROG([UGLIFYJS], [uglifyjs], [], [$npm_path])
 AM_CONDITIONAL([HAVE_UGLIFYJS], [test "x$ac_cv_path_UGLIFYJS" != "x"])

 AC_PATH_PROG([MODERNIZR], [modernizr], [], [$npm_path])
 AM_CONDITIONAL([HAVE_MODERNIZR], [test "x$ac_cv_path_MODERNIZR" != "x"])

 # Tests.
 AC_CONFIG_FILES([install-info/tests/defs])
 dnl We cannot enable the TeX-related tests, so don't waste time
 dnl configuring them.  See contrib/nontests/README.
 dnl AC_CONFIG_FILES([util/tests/defs])
 dnl AC_CHECK_PROGS([HEVEA], [hevea], [])
 dnl AC_CHECK_PROGS([TEX], [tex], [])

 AC_CHECK_PROGS([PROVE], [prove], [])

 tp_tests='no'
 AC_ARG_ENABLE([tp-tests],
     AS_HELP_STRING([--enable-tp-tests],[run the parser and converters testsuite (default: detected)]),
     [if test $enableval = 'no'; then
        tp_tests='no'
      else
        tp_tests='yes'
      fi],
     [
      if test "z$PROVE" = 'z'; then
        tp_tests='no'
      elif $PERL -e "use 5.007_003; use Encode; use Test::More; use File::Basename; use File::Copy; use Data::Dumper; use Data::Compare; use Test::Deep; use Storable qw(dclone); use Getopt::Long qw(GetOptions);" > /dev/null 2>&1;
      then
        tp_tests='yes'
      else
        tp_tests='no'
      fi
     ])

 AC_MSG_CHECKING([parser tests requirements])
 AC_MSG_RESULT([$tp_tests])
 AM_CONDITIONAL([TP_TESTS], [test "z$tp_tests" = 'zyes'])

 build_perl_api_texi='no'
 AC_ARG_ENABLE([perl-api-texi-build],
     AS_HELP_STRING([--enable-perl-api-texi-build],[build the perl api texinfo files (default: detected)]),
     [if test $enableval = 'no'; then
        build_perl_api_texi='no'
      else
        build_perl_api_texi='yes'
      fi],
     [
      if $PERL -e "use 5.007_003; use Encode; use Pod::Simple::PullParser;" > /dev/null 2>&1;
      then
        build_perl_api_texi='yes'
      else
        build_perl_api_texi='no'
      fi
     ])

 AC_MSG_CHECKING([Perl Texinfo API texinfo documentation build requirements])
 AC_MSG_RESULT([$build_perl_api_texi])
 AM_CONDITIONAL([BUILD_PERL_API_TEXI], [test "z$build_perl_api_texi" = 'zyes'])

 pod_simple_texinfo_tests='no'
 AC_ARG_ENABLE([pod-simple-texinfo-tests],
     AS_HELP_STRING([--enable-pod-simple-texinfo-tests],[run the parser and converters testsuite (default: detected)]),
     [if test $enableval = 'no'; then
        pod_simple_texinfo_tests='no'
      else
        pod_simple_texinfo_tests='yes'
      fi],
     [
      if test "z$PROVE" = 'z' ; then
        pod_simple_texinfo_tests='no'
      elif $PERL -e "use 5.007_003; use Encode; use Test::More; use Pod::Simple::PullParser;" > /dev/null 2>&1;
      then
        pod_simple_texinfo_tests='yes'
      else
        pod_simple_texinfo_tests='no'
      fi
     ])

 AC_MSG_CHECKING([Pod::Simple::Texinfo tests requirements])
 AC_MSG_RESULT([$pod_simple_texinfo_tests])
 AM_CONDITIONAL([POD_SIMPLE_TEXINFO_TESTS], [test "z$pod_simple_texinfo_tests" = 'zyes'])

 host_is_windows=no
 case "$host" in
    *-mingw32 | *-mingw64 | *-msdosdjgpp )  host_is_windows=yes ;;
 esac
 AM_CONDITIONAL([HOST_IS_WINDOWS], [test "x$host_is_windows" = "xyes"])
 HOST_IS_WINDOWS_VARIABLE=
 if test "x$host_is_windows" = "xyes" ; then
   HOST_IS_WINDOWS_VARIABLE=yes
 fi
 AC_SUBST([HOST_IS_WINDOWS_VARIABLE])

 # The config files to generate.
 AC_CONFIG_FILES([\
   Makefile
   doc/Makefile
   doc/tp_api/Makefile
   gnulib/lib/Makefile
   info/Makefile
   install-info/Makefile
   install-info/tests/Makefile
   man/Makefile
   po/Makefile.in
   po_document/Makefile.in
   util/Makefile
   texindex/Makefile
   tp/Makefile
   tp/tests/Makefile
   tp/tests/many_input_files/Makefile
   tp/tests/sectioning/Makefile
   tp/tests/formatting/Makefile
   tp/tests/indices/Makefile
   tp/tests/contents/Makefile
   tp/tests/nested_formats/Makefile
   tp/tests/layout/Makefile
   tp/tests/tex_html/Makefile
   tp/tests/other/Makefile
   tp/defs
   js/Makefile
   Pod-Simple-Texinfo/Makefile
 ])

 AC_CONFIG_FILES([pre-inst-env:build-aux/pre-inst-env.in],
   [chmod +x pre-inst-env])

 AC_OUTPUT

 # Summarize warnings to make them more visible.
 if test $have_termlib = no; then
   AC_MSG_WARN([Could not find a terminal library among ${TERMLIB_VARIANTS}])
   AC_MSG_WARN([The programs from `info' directory will not be built.])
 fi
	# Process this file with autoconf to produce a configure script.
	#
	# Copyright 2002-2022 Free Software Foundation, Inc.
	#
	# This file is free software; as a special exception the author gives
	# unlimited permission to copy and/or distribute it, with or without
	# modifications, as long as this notice is preserved.
	#
	# This program is distributed in the hope that it will be useful, but
	# WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
	# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	#
	AC_INIT([GNU Texinfo], [7.0.1], [bug-texinfo@gnu.org])

	dnl Must come before AM_INIT_AUTOMAKE.
	AC_CONFIG_AUX_DIR([build-aux])
	dnl tar-ustar because we have long filenames for some test files.
	dnl parallel-tests as recommended by stefano.
	AM_INIT_AUTOMAKE([1.14 dist-xz
	info-in-builddir parallel-tests tar-ustar])

	# Where to generate output; srcdir location.
	AC_CONFIG_HEADERS([config.h:config.in])dnl Keep filename to 8.3 for MS-DOS.
	AC_CONFIG_SRCDIR([info/info.c])

	# TexinfoXML DTD (./util/texinfo.dtd) version:
	# manually set this to the next version number rather than
	# $PACKAGE_VERSION, as soon as the DTD is modified, and perhaps put the
	# file on the web, too. Several reasons:
	# 1. To avoid using a DTD from the Internet that wouldn't be in sync;
	# 2. To avoid unnnecessary changes in XML output file headers, in
	# test results for instance.
	# 3. It may be kept as is in case there were no change in the DTD
	# between releases. This is rare, but has happened.
	#
	TEXINFO_DTD_VERSION=7.0
	AC_SUBST([TEXINFO_DTD_VERSION])

	# Package date.
	PACKAGE_DATE=`${SHELL} "$srcdir"/build-aux/mdate-sh "$srcdir"/configure.ac`
	AC_SUBST([PACKAGE_DATE])

	# We need Perl
	AC_ARG_VAR([PERL], [The path to the 'perl' executable.])
	AC_PATH_PROG([PERL], [perl])
	if test -z "$PERL"; then
	AC_MSG_ERROR(
	[perl not found; Texinfo requires Perl.
	If you have perl installed somewhere not in PATH,
	specify where it is using
	./configure PERL=/path/to/perl
	])
	fi

	# User variables for a Perl XS extension, which may be different, for
	# example if the Perl interpreter being used was compiled with a
	# different compiler. Also in tp/Texinfo/XS/configure.ac.
	AC_ARG_VAR([PERL_EXT_CFLAGS], [Compiler flags for a Perl extension])
	AC_ARG_VAR([PERL_EXT_CPPFLAGS], [C preprocessor flags for a Perl extension])
	AC_ARG_VAR([PERL_EXT_LDFLAGS], [Linker flags for a Perl extension])
	AC_ARG_VAR([PERL_EXT_CC], [Compiler for a Perl extension])

	AC_MSG_CHECKING([Perl version and modules])
	if $PERL -e "use 5.008_001; use Encode; use Data::Dumper" >/dev/null 2>&1; then
	perl_version_requirement='yes'
	else
	perl_version_requirement='no'
	fi
	AC_MSG_RESULT($perl_version_requirement)
	if test z"$perl_version_requirement" = 'zno' ; then
	AC_MSG_ERROR([perl >= 5.8.1 with Encode and Data::Dumper required by Texinfo.])
	fi


	AC_REQUIRE_AUX_FILE([tap-driver.sh])

	# Find awk for running texindex.
	# Don't use AC_PROG_AWK because this prefers gawk, which may be much
	# slower than the awk that the user has in their path (e.g. mawk).
	# We use AC_PATH_PROGS_FEATURE_CHECK to eliminate archaic versions of
	# awk that don't support user-defined functions.
	AC_CACHE_CHECK([for awk], [ac_cv_path_TI_AWK],
	[AC_PATH_PROGS_FEATURE_CHECK([TI_AWK], [awk gawk mawk nawk],
	[[$ac_path_TI_AWK 'function foo () {}' 2>/dev/null \
	&& ac_cv_path_TI_AWK=$ac_path_TI_AWK ac_path_TI_AWK_found=:]],
	[AC_MSG_ERROR([awk not found])])])
	AC_SUBST([TI_AWK], [$ac_cv_path_TI_AWK])

	# for generating texindex.awk
	AM_MISSING_PROG(GAWK, gawk)

	# Checks for programs.
	AC_PROG_CC

	# Since we use gnulib: gl_EARLY must be called as soon as possible after
	# the C compiler is checked. The others could be later, but we just
	# keep everything together.
	gl_EARLY

	# Rest of Gnulib.
	gl_INIT

	# To generate man pages.
	AM_MISSING_PROG(HELP2MAN, help2man)
	AM_MISSING_PROG(POD2MAN, pod2man)

	AC_PROG_INSTALL
	AC_PROG_MAKE_SET

	AC_PROG_LN_S
	AC_PROG_MKDIR_P

	# gettext Makefiles may still need MKINSTALLDIRS.
	MKINSTALLDIRS="\$(top_srcdir)/build-aux/install-sh -d"
	AC_SUBST([MKINSTALLDIRS])

	# check whether diff accepts the -u option (not on HP-UX).
	AC_MSG_CHECKING(whether diff accepts -u)
	diff_accepts_u_option=no
	echo foo >conftest.dtx
	echo foo \| diff -u - conftest.dtx >/dev/null 2>&1
	error_status_diff_u=$?
	if test $error_status_diff_u = 0; then
	diff_accepts_u_option=yes
	fi
	AC_MSG_RESULT($diff_accepts_u_option)
	rm -f conftest.dtx

	DIFF_U_OPTION=
	if test "z$diff_accepts_u_option" = 'zyes' ; then
	DIFF_U_OPTION=-u
	fi
	AC_SUBST([DIFF_U_OPTION])

	# check whether diff accepts the -a option (only needed for GNU diff).
	AC_MSG_CHECKING(whether diff accepts -a)
	diff_accepts_a_option=no
	echo foo >conftest.dtx
	echo foo \| diff -a - conftest.dtx >/dev/null 2>&1
	error_status_diff_a=$?
	if test $error_status_diff_a = 0; then
	diff_accepts_a_option=yes
	fi
	AC_MSG_RESULT($diff_accepts_a_option)
	rm -f conftest.dtx

	DIFF_A_OPTION=
	if test "z$diff_accepts_a_option" = 'zyes' ; then
	DIFF_A_OPTION=-a
	fi
	AC_SUBST([DIFF_A_OPTION])

	# Checks for header files.
	AC_CHECK_HEADERS(io.h pwd.h \
	termcap.h termios.h unistd.h \
	sys/ioctl.h sys/time.h sys/wait.h)

	AC_SYS_POSIX_TERMIOS

	AC_TYPE_OFF_T

	# Checks for library functions.
	AC_CHECK_FUNCS(setlocale sigaction sigprocmask posix_openpt)

	# Used for Info tests
	AM_CONDITIONAL([have_ptys], [test x$ac_cv_func_posix_openpt = xyes])

	# We want to recognize djgpp to avoid the useless warning about no
	# term library.
	AC_CANONICAL_BUILD

	# We need to run some of our own binaries, most notably makedoc, but as
	# long as we have this process, we also use our own makeinfo and
	# install-info.
	#
	# This means that if we are cross compiling, we have to configure the
	# package twice: once with the native compiler (this is done in a
	# subdirectory $native_tools), and once with the cross compiler.
	# The former is invoked automatically here, with --host=$build.
	# $native_tools is also added to SUBDIRS in the main Makefile.am,
	# so that make compiles the native tools first.
	#
	if test "$cross_compiling" = no; then
	native_tools=
	else
	native_tools=tools
	test -d "$native_tools" \|\| mkdir "$native_tools"
	confdir=`(cd "$srcdir";pwd)`
	# Make sure the secondary configure won't fail with
	# "error: source directory already configured".
	rm -f config.status
	AC_MSG_NOTICE([[Doing configure of native tools (${build}).]])
	cd "$native_tools" \|\| exit 1
	# Run secondary configure in alternate environment or
	# it gets the wrong CC etc.
	# env -i gives this build host configure a clean environment;
	# consequently, we have to re-initialize $PATH.
	env -i CC="$BUILD_CC" AR="$BUILD_AR" RANLIB="$BUILD_RANLIB" \
	PATH="$PATH" \
	tools_only=1 \
	${confdir}/configure --build=${build} --host=${build} \
	--disable-rpath --disable-nls
	cd .. \|\| exit 1
	AC_MSG_NOTICE([[Continuing with main configure (${host}).]])
	fi
	AC_SUBST(native_tools)
	AM_CONDITIONAL(TOOLS_ONLY, [[test "x$tools_only" = x1]])

	# Some GNU/Linux systems (e.g., SuSE 4.3, 1996) don't have curses, but
	# rather ncurses. So we check for it.
	TERMLIBS=
	# Check for termlib before termcap because Solaris termcap needs libucb.
	TERMLIB_VARIANTS="tinfo ncurses curses termlib termcap terminfo"
	for termlib in ${TERMLIB_VARIANTS}; do
	AC_CHECK_LIB(${termlib}, tgetent,
	[TERMLIBS="${TERMLIBS} -l${termlib}"; break])
	done
	have_termlib=yes
	# don't bother warning on djgpp and MinGW, they don't have a term library,
	# and port each termcap-needing program separately according to the needs.
	if test -z "$TERMLIBS" \
	&& echo "$build" \| grep -v djgpp \| grep -v mingw >/dev/null; then
	AC_MSG_WARN([info needs a terminal library, one of: ${TERMLIB_VARIANTS}])
	have_termlib=no
	fi

	# Checks for variables.
	# HP-UX 9 (at least) needs -lncurses which defines termcap variables PC etc.
	AC_MSG_CHECKING(for library with termcap variables)
	AC_CACHE_VAL(ac_cv_var_ospeed,
	[oldLIBS=$LIBS
	for trylib in $termlib ${TERMLIB_VARIANTS}; do
	if test "x$trylib" != "x$termlib"; then
	LIBS="$oldLIBS -l$termlib -l$trylib"
	else
	LIBS="$oldLIBS -l$termlib"
	fi
	AC_LINK_IFELSE([AC_LANG_PROGRAM([], [[#ifdef HAVE_NCURSES_TERMCAP_H
	#include <ncurses/termcap.h>
	#else
	#ifdef HAVE_TERMCAP_H
	#include <termcap.h>
	#else
	#undef PC
	char *BC;
	char **UP;
	char PC;
	short ospeed;
	#endif
	#endif
	/* Make sure all variables actually exist. AIX 4.3 has ospeed but no BC.
	--Andreas Ley <andy@rz.uni-karlsruhe.de> 24 Aug 2000. */
	BC++;
	UP++;
	PC++;
	return ospeed != 0;
	]])], [ac_cv_var_ospeed=$trylib; break])
	done
	LIBS=$oldLIBS
	])
	AC_MSG_RESULT($ac_cv_var_ospeed)
	if test -n "$ac_cv_var_ospeed" \
	&& test "x$termlib" != "x$ac_cv_var_ospeed"; then
	TERMLIBS="${TERMLIBS} -l${ac_cv_var_ospeed}"
	fi
	AC_SUBST(TERMLIBS)#
	AM_CONDITIONAL(HAVE_TERMLIBS, [[test "x$TERMLIBS" != x]])

	# Do not use <ncurses/termcap.h> unless we're linking with ncurses.
	# Must come after the termlib tests.
	if test "x$termlib" = xncurses; then
	# Use AC_CHECK_HEADERS so the HAVE_*_H symbol gets defined.
	AC_CHECK_HEADERS(ncurses/termcap.h)
	fi

	# For teTeX and TeX Live.
	AC_CANONICAL_HOST
	AC_ARG_ENABLE([multiplatform],
	[AS_HELP_STRING([--enable-multiplatform],
	[put executables into bin/PLATFORM and libraries into lib/PLATFORM])])dnl
	# if enable_multiplatform is set in the environment, use that.
	if test "x$enable_multiplatform" = xyes; then
	test "x$bindir" = 'x${exec_prefix}/bin' && bindir="$bindir/$host"
	test "x$libdir" = 'x${exec_prefix}/lib' && libdir="$libdir/$host"
	fi

	# Taken from the example in
	# http://www.gnu.org/software/automake/manual/html_node/Conditionals.html.
	AC_ARG_ENABLE(install-warnings,
	[ --disable-install-warnings omit make install warnings about TeX files],
	[case "${enableval}" in
	yes) install_warnings=true ;;
	no) install_warnings=false ;;
	*) AC_MSG_ERROR(bad value ${enableval} for --enable-install-warnings) ;;
	esac],
	[install_warnings=true])
	AM_CONDITIONAL(INSTALL_WARNINGS,
	test x"$install_warnings" = xtrue \|\| test x"$install_warnings" = xyes)

	USE_EXTERNAL_EASTASIANWIDTH=no
	AC_ARG_WITH([external-Unicode-EastAsianWidth],
	AS_HELP_STRING([--with-external-Unicode-EastAsianWidth],[use external Unicode-EastAsianWidth (default: no)]),
	[if test $withval = 'yes'; then
	USE_EXTERNAL_EASTASIANWIDTH=yes
	fi]
	)

	AC_SUBST([USE_EXTERNAL_EASTASIANWIDTH])

	USE_EXTERNAL_UNIDECODE=no
	AC_ARG_WITH([external-Text-Unidecode],
	AS_HELP_STRING([--with-external-Text-Unidecode],[use external Text::Unidecode (default: no)]),
	[if test $withval = 'yes'; then
	USE_EXTERNAL_UNIDECODE=yes
	fi]
	)

	AC_SUBST([USE_UNICODE])
	AC_SUBST([USE_EXTERNAL_UNIDECODE])

	# i18n support. To update to a new version of gettext, run:
	# gettextize -f --po-dir=po --po-dir=po_document
	# See http://gnu.org/s/gnulib/manual/html_node/gettextize-and-autopoint.html.
	AM_GNU_GETTEXT_VERSION([0.21])
	AM_GNU_GETTEXT([external])

	USE_EXTERNAL_LIBINTL=no
	AC_ARG_WITH([external-libintl-perl],
	AS_HELP_STRING([--with-external-libintl-perl],[use external libintl-perl (default: no)]),
	[if test $withval = 'yes'; then
	USE_EXTERNAL_LIBINTL=yes
	fi]
	)

	AC_SUBST([USE_EXTERNAL_LIBINTL])

	AC_ARG_ENABLE([perl-xs],
	AS_HELP_STRING([--enable-perl-xs],[build Perl XS modules for speed (default: check)]),
	[ enable_xs=$enableval],
	[ enable_xs=check])

	# Set xs_srcdir to the path from XS builddir to srcdir
	case $srcdir in
	.) # We are building in place.
	xs_srcdir=../.. ;;
	[[\\/]]* \| ?:[[\\/]]* ) # Absolute name.
	xs_srcdir=$srcdir/tp ;;
	*) # Relative name.
	xs_srcdir=../../../$srcdir/tp ;;
	esac

	# Pass on all the options we were given to the subsidiary configure
	# script.
	# Don't use AC_CONFIG_SUBDIRS for this because it isn't done right away,
	# and we need it for the check that follows.
	# We use the _AC_OUTPUT_SUBDIRS internal autoconf macro
	# (in /usr/share/autoconf/autoconf/status.m4) for this in order to
	# pass on the configure command line correctly; for example, adjusting
	# paths. It is done in a subshell to be resilient against failure of the
	# subsidiary configure script, which happens if the C compiler is found
	# not to work.
	#
	save_subdirs=$subdirs
	subdirs=tp/Texinfo/XS
	( _AC_OUTPUT_SUBDIRS ) \|\| enable_xs=no
	subdirs=$save_subdirs

	if test $enable_xs = no; then
	AC_MSG_NOTICE([building Perl extension (XS) modules will be disabled])
	fi

	if test $enable_xs = check; then
	AC_MSG_CHECKING([whether we can build Perl extension (XS) modules])
	AC_MSG_RESULT([])
	enable_xs=no
	(cd tp/Texinfo/XS \
	&& make clean \
	&& make TestXS.la \
	&& TEXINFO_XS=debug ; export TEXINFO_XS \
	&& ${PERL} -I . \
	-I ${xs_srcdir} \
	-e 'require Texinfo::XS::TestXS;' \
	\| grep 'message from XS module') \
	&& enable_xs=yes
	AC_MSG_CHECKING([whether we can build Perl extension (XS) modules])
	AC_MSG_RESULT([$enable_xs])
	fi

	AC_SUBST([enable_xs])

	AM_CONDITIONAL([DISABLE_XS], [test "z$enable_xs" = zno])

	# Texinfo JS Interface
	npm_path="${srcdir}/js/node_modules/.bin${PATH_SEPARATOR}$PATH"

	AC_PATH_PROG([ESLINT], [eslint], [], [$npm_path])
	AM_CONDITIONAL([HAVE_ESLINT], [test "x$ac_cv_path_ESLINT" != "x"])

	AC_PATH_PROG([TSC], [tsc], [], [$npm_path])
	AM_CONDITIONAL([HAVE_TYPESCRIPT], [test "x$ac_cv_path_TSC" != "x"])

	AC_PATH_PROG([UGLIFYJS], [uglifyjs], [], [$npm_path])
	AM_CONDITIONAL([HAVE_UGLIFYJS], [test "x$ac_cv_path_UGLIFYJS" != "x"])

	AC_PATH_PROG([MODERNIZR], [modernizr], [], [$npm_path])
	AM_CONDITIONAL([HAVE_MODERNIZR], [test "x$ac_cv_path_MODERNIZR" != "x"])

	# Tests.
	AC_CONFIG_FILES([install-info/tests/defs])
	dnl We cannot enable the TeX-related tests, so don't waste time
	dnl configuring them. See contrib/nontests/README.
	dnl AC_CONFIG_FILES([util/tests/defs])
	dnl AC_CHECK_PROGS([HEVEA], [hevea], [])
	dnl AC_CHECK_PROGS([TEX], [tex], [])

	AC_CHECK_PROGS([PROVE], [prove], [])

	tp_tests='no'
	AC_ARG_ENABLE([tp-tests],
	AS_HELP_STRING([--enable-tp-tests],[run the parser and converters testsuite (default: detected)]),
	[if test $enableval = 'no'; then
	tp_tests='no'
	else
	tp_tests='yes'
	fi],
	[
	if test "z$PROVE" = 'z'; then
	tp_tests='no'
	elif $PERL -e "use 5.007_003; use Encode; use Test::More; use File::Basename; use File::Copy; use Data::Dumper; use Data::Compare; use Test::Deep; use Storable qw(dclone); use Getopt::Long qw(GetOptions);" > /dev/null 2>&1;
	then
	tp_tests='yes'
	else
	tp_tests='no'
	fi
	])

	AC_MSG_CHECKING([parser tests requirements])
	AC_MSG_RESULT([$tp_tests])
	AM_CONDITIONAL([TP_TESTS], [test "z$tp_tests" = 'zyes'])

	build_perl_api_texi='no'
	AC_ARG_ENABLE([perl-api-texi-build],
	AS_HELP_STRING([--enable-perl-api-texi-build],[build the perl api texinfo files (default: detected)]),
	[if test $enableval = 'no'; then
	build_perl_api_texi='no'
	else
	build_perl_api_texi='yes'
	fi],
	[
	if $PERL -e "use 5.007_003; use Encode; use Pod::Simple::PullParser;" > /dev/null 2>&1;
	then
	build_perl_api_texi='yes'
	else
	build_perl_api_texi='no'
	fi
	])

	AC_MSG_CHECKING([Perl Texinfo API texinfo documentation build requirements])
	AC_MSG_RESULT([$build_perl_api_texi])
	AM_CONDITIONAL([BUILD_PERL_API_TEXI], [test "z$build_perl_api_texi" = 'zyes'])

	pod_simple_texinfo_tests='no'
	AC_ARG_ENABLE([pod-simple-texinfo-tests],
	AS_HELP_STRING([--enable-pod-simple-texinfo-tests],[run the parser and converters testsuite (default: detected)]),
	[if test $enableval = 'no'; then
	pod_simple_texinfo_tests='no'
	else
	pod_simple_texinfo_tests='yes'
	fi],
	[
	if test "z$PROVE" = 'z' ; then
	pod_simple_texinfo_tests='no'
	elif $PERL -e "use 5.007_003; use Encode; use Test::More; use Pod::Simple::PullParser;" > /dev/null 2>&1;
	then
	pod_simple_texinfo_tests='yes'
	else
	pod_simple_texinfo_tests='no'
	fi
	])

	AC_MSG_CHECKING([Pod::Simple::Texinfo tests requirements])
	AC_MSG_RESULT([$pod_simple_texinfo_tests])
	AM_CONDITIONAL([POD_SIMPLE_TEXINFO_TESTS], [test "z$pod_simple_texinfo_tests" = 'zyes'])

	host_is_windows=no
	case "$host" in
	-mingw32 \| -mingw64 \| *-msdosdjgpp ) host_is_windows=yes ;;
	esac
	AM_CONDITIONAL([HOST_IS_WINDOWS], [test "x$host_is_windows" = "xyes"])
	HOST_IS_WINDOWS_VARIABLE=
	if test "x$host_is_windows" = "xyes" ; then
	HOST_IS_WINDOWS_VARIABLE=yes
	fi
	AC_SUBST([HOST_IS_WINDOWS_VARIABLE])

	# The config files to generate.
	AC_CONFIG_FILES([\
	Makefile
	doc/Makefile
	doc/tp_api/Makefile
	gnulib/lib/Makefile
	info/Makefile
	install-info/Makefile
	install-info/tests/Makefile
	man/Makefile
	po/Makefile.in
	po_document/Makefile.in
	util/Makefile
	texindex/Makefile
	tp/Makefile
	tp/tests/Makefile
	tp/tests/many_input_files/Makefile
	tp/tests/sectioning/Makefile
	tp/tests/formatting/Makefile
	tp/tests/indices/Makefile
	tp/tests/contents/Makefile
	tp/tests/nested_formats/Makefile
	tp/tests/layout/Makefile
	tp/tests/tex_html/Makefile
	tp/tests/other/Makefile
	tp/defs
	js/Makefile
	Pod-Simple-Texinfo/Makefile
	])

	AC_CONFIG_FILES([pre-inst-env:build-aux/pre-inst-env.in],
	[chmod +x pre-inst-env])

	AC_OUTPUT

	# Summarize warnings to make them more visible.
	if test $have_termlib = no; then
	AC_MSG_WARN([Could not find a terminal library among ${TERMLIB_VARIANTS}])
	AC_MSG_WARN([The programs from `info' directory will not be built.])
	fi