elinks/configure.in

dnl Process this file with autoconf to produce a configure script.

dnl There are two types of comments in this file.
dnl Comments that refer to Autoconf macros begin with "dnl", and m4
dnl discards them.  Other comments begin with "#", and they get copied
dnl to the configure script, hopefully making it easier to read.

dnl Autoconf 2.13 generates an incomplete config.h.in; see ELinks bug 936.
dnl Autoconf 2.59 is installed in the computer that generates our nightly
dnl snapshots, so we need to be compatible with that.
AC_PREREQ(2.59)
AC_INIT
AC_CONFIG_SRCDIR([src/main/main.c])
AC_CONFIG_AUX_DIR(config)

PACKAGE=elinks
VERSION=0.12pre2.GIT
AC_SUBST(PACKAGE)
AC_SUBST(VERSION)
AC_DEFINE_UNQUOTED(PACKAGE, "$PACKAGE", [Package version])
AC_DEFINE_UNQUOTED(VERSION, "$VERSION", [Package version])
AC_CONFIG_HEADERS(config.h)

AC_CHECK_PROG(ACLOCAL,[aclocal],[aclocal],[config/missing aclocal])
AC_CHECK_PROG(AUTOCONF,[autoconf],[autoconf],[config/missing autoconf])
AC_CHECK_PROG(AUTOHEADER,[autoheader],[autoheader],[config/missing autoheader])

MAKE=

for make in gnumake gmake make false; do
	if test "x$MAKE" = x; then
		AC_PATH_PROGS(MAKE, "$make")
	fi
done

builddir="`pwd`"

# Cleanup if we are configuring with a previous build in the tree
if test -e Makefile.config; then
	AC_MSG_CHECKING([for previous build to clean])
	"$MAKE" -C "$builddir/src" cleanall >/dev/null 2>/dev/null
	AC_MSG_RESULT(done)
fi

# ===================================================================
# Load feature configuration file and start logging features.
# ===================================================================

features="features.conf"
AC_CHECK_FILE("$srcdir/$features", [ . $srcdir/$features ])
AC_CHECK_FILE("$builddir/$features", [ . $builddir/$features ])
echo "Feature summary:" > features.log

# ===================================================================
# Checks for programs.
# ===================================================================

AC_PROG_CC
AC_PROG_AWK
AC_PATH_PROGS(AWK, "$AWK")
AC_PROG_RANLIB
AC_PROG_INSTALL

AC_PATH_PROGS(GIT, "git")
AC_PATH_PROGS(SPARSE, "sparse")

CONFIG_ASCIIDOC="no"
CONFIG_POD2HTML="no"
CONFIG_XMLTO="no"
CONFIG_JW="no"

if test "x$CONFIG_DOC" != xno; then
	AC_PATH_PROGS(ASCIIDOC, "asciidoc")
	if test "x$ASCIIDOC" != "x"; then
		EL_CONFIG(CONFIG_ASCIIDOC, [AsciiDoc])
		EL_CONFIG(MANUAL_ASCIIDOC, [HTML (one file)])
		EL_CONFIG(MAN_ASCIIDOC, [HTML])

		echo > config.asciidoc-unsafe.txt
		if "$ASCIIDOC" --unsafe config.asciidoc-unsafe.txt >/dev/null 2>/dev/null; then
			ASCIIDOC_FLAGS=--unsafe
		fi
		rm config.asciidoc-unsafe.*
	fi

	AC_PATH_PROGS(XMLTO, "xmlto")
      	if test "x$XMLTO" != "x"; then
		EL_CONFIG(CONFIG_XMLTO, [XmlTo])
		EL_CONFIG(MANUAL_XMLTO, [HTML (multiple files)])
		EL_CONFIG(MAN_XMLTO, [man (groff)])
	fi

	AC_PATH_PROGS(JW, "jw")
      	if test "x$JW" != "x"; then
		EL_CONFIG(CONFIG_JW, [JadeWrapper])
		EL_CONFIG(MANUAL_JW, [PDF])
	fi

	AC_PATH_PROGS(POD2HTML, "pod2html")
      	if test "x$POD2HTML" != "x"; then
		EL_CONFIG(CONFIG_POD2HTML, [Pod2HTML])
	fi

	AC_PATH_PROGS(DOXYGEN, "doxygen")
	if test "x$DOXYGEN" != "x"; then
		EL_CONFIG(CONFIG_DOXYGEN, [Doxygen])
		api_srcdir="$(cd "$srcdir" && pwd)/src"
		AC_SUBST(api_srcdir)
	fi
fi

AC_SUBST(ASCIIDOC_FLAGS)
AC_SUBST(CONFIG_ASCIIDOC)
AC_SUBST(CONFIG_DOXYGEN)
AC_SUBST(CONFIG_POD2HTML)
AC_SUBST(CONFIG_XMLTO)
AC_SUBST(CONFIG_JW)

EL_CONFIG_DEPENDS(CONFIG_DOC, [CONFIG_ASCIIDOC CONFIG_XMLTO CONFIG_JW CONFIG_POD2HTML], [Documentation Tools])
EL_CONFIG_DEPENDS(CONFIG_MANUAL, [MANUAL_ASCIIDOC MANUAL_XMLTO MANUAL_JW], [Manual Formats])
EL_CONFIG_DEPENDS(CONFIG_MANPAGE, [MAN_ASCIIDOC MAN_XMLTO], [Man Page Formats])
EL_CONFIG_DEPENDS(CONFIG_APIDOCS, [CONFIG_DOXYGEN], [API Documentation])

# gcc specific options (to be continued at the bottom of configure)
if test "x$ac_cv_c_compiler_gnu" = "xyes"; then
  # We want to see all warnings and live with none.
  # We can't set up -Werror here as there may be some warnings in test
  # suite of configure, and we don't want to fail them.
  CFLAGS="$CFLAGS -Wall"
fi

# ===================================================================
# Checks for special OSes.
# ===================================================================

dnl EL_CHECK_COMPILER_MACRO(define, name, flagname)
AC_DEFUN([EL_CHECK_COMPILER_MACROS],
[
	AC_MSG_CHECKING([for $2])

	for flag in $3; do
		AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[#ifndef $flag
kill me!
#endif ]])],[$1=yes],[$1=no])
		if test "[$]$1" = yes; then
			EL_CONFIG([$1], [$2])
			break
		fi
	done

	AC_MSG_RESULT([$]$1)
])

EL_CHECK_COMPILER_MACROS(CONFIG_OS_BEOS, [BEOS], [__BEOS__])
AC_SUBST(CONFIG_OS_BEOS)

EL_CHECK_COMPILER_MACROS(CONFIG_OS_RISCOS, [RISCOS], [__riscos__])
AC_SUBST(CONFIG_OS_RISCOS)

EL_CHECK_COMPILER_MACROS(CONFIG_OS_WIN32, [WIN32], [_WIN32 __WIN32__])
AC_SUBST(CONFIG_OS_WIN32)

EL_CHECK_COMPILER_MACROS(CONFIG_OS_OS2, [EMX], [__EMX__])
AC_SUBST(CONFIG_OS_OS2)
test "$CONFIG_OS_OS2" = yes && LDFLAGS=`echo "$LDFLAGS" | sed "s/-Zexe//g"`

AC_MSG_CHECKING([for UNIX])
dnl FIXME: some depend kind of mechanism
if test "$CONFIG_OS_BEOS" = no && \
   test "$CONFIG_OS_RISCOS" = no && \
   test "$CONFIG_OS_WIN32" = no && \
   test "$CONFIG_OS_OS2" = no; then
	EL_CONFIG(CONFIG_OS_UNIX, [UNIX])
else
	CONFIG_OS_UNIX=no
fi
AC_MSG_RESULT($CONFIG_OS_UNIX)
AC_SUBST(CONFIG_OS_UNIX)

# ===================================================================
# Checks for header files.
# ===================================================================

AC_HEADER_DIRENT
AC_HEADER_STDC
AC_HEADER_SYS_WAIT
AC_HEADER_TIME

AC_CHECK_HEADERS(wctype.h)
AC_CHECK_HEADERS(fcntl.h limits.h time.h unistd.h)
AC_CHECK_HEADERS(sigaction.h)
AC_CHECK_HEADERS(arpa/inet.h)
AC_CHECK_HEADERS(netinet/in_systm.h netinet/in_system.h netinet/ip.h)
AC_CHECK_HEADERS(netdb.h netinet/in.h netinet/in6_var.h)
AC_CHECK_HEADERS(ifaddrs.h)
AC_CHECK_HEADERS(sys/cygwin.h io.h)
AC_CHECK_HEADERS(sys/fmutex.h)
AC_CHECK_HEADERS(sys/ioctl.h sys/sockio.h)
AC_CHECK_HEADERS(sys/resource.h)
AC_CHECK_HEADERS(sys/select.h)
AC_CHECK_HEADERS(sys/signal.h)
AC_CHECK_HEADERS(sys/socket.h)
AC_CHECK_HEADERS(sys/time.h)
AC_CHECK_HEADERS(sys/utsname.h)
AC_CHECK_HEADERS([net/if.h], [], [],
[[#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h> /* <net/if.h> on Mac OS X 10.5.4 needs this */
#endif
]])
AC_CHECK_HEADERS(stdint.h inttypes.h)
AC_CHECK_HEADERS(locale.h pwd.h)
AC_CHECK_HEADERS(termios.h)


AC_CHECK_HEADERS(sys/un.h,
	[CONFIG_INTERLINK=yes
	 EL_CONFIG([CONFIG_INTERLINK], [interlinking])],
	[CONFIG_INTERLINK=no])
AC_SUBST(CONFIG_INTERLINK)

# ===================================================================
# Checks for typedefs, structures, and compiler characteristics.
# ===================================================================

AC_STRUCT_TM
AC_C_CONST
AC_C_INLINE
EL_CHECK_CODE(typeof, HAVE_TYPEOF, [], [int a; typeof(a) b;])

AC_SYS_LARGEFILE
AC_TYPE_SIZE_T
AC_TYPE_OFF_T
EL_CHECK_TYPE(ssize_t, int)
EL_CHECK_SYS_TYPE(long long, HAVE_LONG_LONG, [])
EL_CHECK_SYS_TYPE(off_t, HAVE_OFF_T, [])
EL_CHECK_INT_TYPE(int32_t, HAVE_INT32_T)
EL_CHECK_INT_TYPE(uint32_t, HAVE_UINT32_T)
EL_CHECK_INT_TYPE(uint16_t, HAVE_UINT16_T)

AC_CHECK_SIZEOF(char, 1)
AC_CHECK_SIZEOF(short, 2)
AC_CHECK_SIZEOF(int, 4)
AC_CHECK_SIZEOF(long, 4)
test "x$HAVE_LONG_LONG" = xyes && AC_CHECK_SIZEOF(long long, 8)
test "x$HAVE_OFF_T" = xyes && AC_CHECK_SIZEOF(off_t, 4)

# Check for variadic macros
EL_CHECK_CODE([variadic macros], HAVE_VARIADIC_MACROS,
		[#include <stdio.h>
		 #define a(b,c...) printf(b,##c)],
                [a("foo");a("%s","bar");a("%s%s","baz","quux");])

# ===================================================================
# Check for POSIX <regex.h>
# ===================================================================

EL_CHECK_SYS_TYPE(regex_t, HAVE_REGEX_H, [#include <regex.h>])

# ===================================================================
# Checks for library functions.
# ===================================================================

AC_PROG_GCC_TRADITIONAL
AC_FUNC_MEMCMP
AC_FUNC_MMAP
AC_FUNC_STRFTIME
AC_CHECK_FUNCS(atoll gethostbyaddr herror strerror)
AC_CHECK_FUNCS(popen uname access chmod alarm timegm mremap)
AC_CHECK_FUNCS(strcasecmp strncasecmp strcasestr strstr strchr strrchr)
AC_CHECK_FUNCS(memmove bcopy stpcpy strdup index isdigit mempcpy memrchr)
AC_CHECK_FUNCS(snprintf vsnprintf asprintf vasprintf)
AC_CHECK_FUNCS(getifaddrs getpwnam inet_pton inet_ntop)
AC_CHECK_FUNCS(fflush fsync fseeko ftello sigaction)
AC_CHECK_FUNCS(gettimeofday clock_gettime)

AC_CHECK_FUNCS([cygwin_conv_to_full_win32_path])

AC_CHECK_FUNCS(setenv putenv, HAVE_SETENV_OR_PUTENV=yes)
AC_CHECK_FUNCS(getuid, HAVE_GETUID=yes)
AC_CHECK_FUNCS(geteuid, HAVE_GETEUID=yes)

# These aren't probably needed now, as they are commented in links.h.
# I've no idea about their historical background, but I keep them here
# just in the case they will help later. --pasky
AC_CHECK_FUNCS(getpid, HAVE_GETPID=yes)
AC_CHECK_FUNCS(setpgid getpgid setpgrp getpgrp)
AC_CHECK_FUNCS(raise, HAVE_RAISE=yes)
AC_CHECK_FUNCS(kill, HAVE_KILL=yes)

if test x"$HAVE_RAISE" = x; then
	if test x"$HAVE_KILL" = x || test x"$HAVE_GETPID" = x; then
		AC_MSG_ERROR([Unable to emulate raise()])
	fi
fi

AC_CACHE_CHECK([for __va_copy],el_cv_HAVE_VA_COPY,[
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdarg.h>
va_list ap1,ap2;]], [[__va_copy(ap1,ap2);]])],[el_cv_HAVE_VA_COPY=yes],[el_cv_HAVE_VA_COPY=no])])
if test x"$el_cv_HAVE_VA_COPY" = x"yes"; then
	EL_DEFINE(HAVE_VA_COPY, __va_copy)
fi

AC_CACHE_CHECK([for sysconf(_SC_PAGE_SIZE)],el_cv_HAVE_SC_PAGE_SIZE,[
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h>
]], [[int page_size = sysconf(_SC_PAGE_SIZE);]])],[el_cv_HAVE_SC_PAGE_SIZE=yes],[el_cv_HAVE_SC_PAGE_SIZE=no])])
if test x"$el_cv_HAVE_SC_PAGE_SIZE" = x"yes"; then
	EL_DEFINE(HAVE_SC_PAGE_SIZE, _SC_PAGE_SIZE)
fi

AC_CACHE_CHECK([for C99 vsnprintf],el_cv_HAVE_C99_VSNPRINTF,[
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>

char buf[8];

int bar(char *buf, const char *format, va_list ap)
{
       return vsnprintf(buf, 0, format, ap);
}

void foo(const char *format, ...) {
       va_list ap;
       int len;

       va_start(ap, format);
       len = bar(buf, format, ap);
       va_end(ap);
       if ((len != 6) && (len != 7)) exit(1); /* \n -> \r\n */

       va_start(ap, format);
       len = bar(buf, format, ap);
       va_end(ap);
       if ((len != 6) && (len != 7)) exit(1);

       if (snprintf(buf, 3, "hello") != 5 || strcmp(buf, "he") != 0) exit(1);

       exit(0);
}
main() { foo("hello\n"); }
]])],[el_cv_HAVE_C99_VSNPRINTF=yes],[el_cv_HAVE_C99_VSNPRINTF=no],[el_cv_HAVE_C99_VSNPRINTF=cross])])
if test x"$el_cv_HAVE_C99_VSNPRINTF" = x"yes"; then
	EL_DEFINE(HAVE_C99_VSNPRINTF, [C99 compliant vsnprintf()])
fi

# OpenSSL and Lua frequently need dlopen
AC_CHECK_LIB(dl, dlopen)

# ===================================================================
# Checks for libraries.
# ===================================================================

AC_CHECK_FUNC(socket, cf_result=yes, cf_result=no)
if test "$cf_result" = no; then
	AC_CHECK_LIB(socket, socket)
fi

AC_CHECK_FUNC(setsockopt, cf_result=yes, cf_result=no)
if test "$cf_result" = no; then
	AC_CHECK_LIB(socket, setsockopt)
fi

AC_CHECK_FUNC(gethostbyname, cf_result=yes, cf_result=no)
if test "$cf_result" = no; then
	AC_CHECK_LIB(socket, gethostbyname, cf_result=yes, cf_result=no)
	if test "$cf_result" = no; then
		AC_CHECK_LIB(nsl, gethostbyname)
	else
		test -z "`echo $LIBS | grep -- -lsocket`" && LIBS="$LIBS -lsocket"
	fi
fi

# ===================================================================
# Checks for packaging specific options.
# ===================================================================

AC_ARG_WITH(xterm, [  --with-xterm            how to invoke the X terminal emulator],
            [ if test "$withval" != no && test "$withval" != yes; then
		AC_DEFINE_UNQUOTED(XTERM, "$withval", [How to invoke XTerm])
	      fi ])

# ===================================================================
# Checks for a libraries, optional even if installed.
# ===================================================================

dnl EL_CHECK_OPTIONAL_LIBRARY(define, name, header, lib, function)
AC_DEFUN([EL_CHECK_OPTIONAL_LIBRARY],
[
	AC_MSG_CHECKING([for $2 support])

	if test "[$]$1" != no; then
		AC_MSG_RESULT(yes)
		EL_SAVE_FLAGS
		if test -n "$withval" && test -d "$withval"; then
			# Be a little more careful when setting
			# include and lib directories. This way
			# $withval will work when includes are
			# there but the library is in the common
			# /usr/lib ... Does the right thing when
			# looking for gc on Debian.
			if test -d "$withval/include"; then
				CFLAGS="$CFLAGS -I$withval/include"
				CPPFLAGS="$CPPFLAGS -I$withval/include"
			else
				CFLAGS="$CFLAGS -I$withval"
				CPPFLAGS="$CPPFLAGS -I$withval"
			fi
			if test -d "$withval/lib"; then
				LDFLAGS="$LDFLAGS -L$withval/lib"
			fi
		fi

		AC_CHECK_HEADERS([$3], [$1=yes], [$1=no; break;])
		if test "[$]$1" = yes; then
			AC_CHECK_LIB([$4], [$5], [$1=yes], [$1=no])
		fi

		if test "[$]$1" = yes; then
			EL_CONFIG([$1], [$2])
			LIBS="$LIBS -l$4"
		else
			if test -n "[$]WITHVAL_$1" &&
			   test "[$]WITHVAL_$1" != xno; then
				AC_MSG_ERROR([$2 not found])
			fi
			EL_RESTORE_FLAGS
		fi
	else
		AC_MSG_RESULT(disabled)
	fi
])

dnl EL_CONFIG_OPTIONAL_LIBRARY(define, name, header, lib, function, confhelp)
AC_DEFUN([EL_CONFIG_OPTIONAL_LIBRARY],
[
	$1=yes
	WITHVAL_$1=

	AC_ARG_WITH([$2], [$6], [WITHVAL_$1="[$]withval"])
	if test "x[$]WITHVAL_$1" = xno; then $1=no; fi

	EL_CHECK_OPTIONAL_LIBRARY([$1], [$2], [$3], [$4], [$5])

	EL_LOG_CONFIG([$1], [$2], [])
])

EL_CONFIG_OPTIONAL_LIBRARY(CONFIG_GPM, gpm, gpm.h, gpm, Gpm_Open,
	[  --without-gpm           disable gpm (mouse) support])

# ELinks calls deflateInit2 with windowBits = MAX_WBITS | 32, to
# enable automatic decoding of both zlib and gzip headers.  This
# feature was added in zlib 1.2.0.2; earlier versions return an error.
# The gzclearerr function was also added in zlib 1.2.0.2, so check for
# that, even though ELinks does not actually call gzclearerr.
EL_CONFIG_OPTIONAL_LIBRARY(CONFIG_GZIP, zlib, zlib.h, z, gzclearerr,
	[  --without-zlib          disable zlib support])

EL_CONFIG_OPTIONAL_LIBRARY(CONFIG_BZIP2, bzlib, bzlib.h, bz2, BZ2_bzReadOpen,
	[  --without-bzlib         disable bzlib support])

EL_CONFIG_OPTIONAL_LIBRARY(CONFIG_IDN, idn, idna.h, idn, stringprep_check_version,
	[  --without-idn           disable international domain names support])

if test "x{with_gc}" != xno; then
	EL_CONFIG_OPTIONAL_LIBRARY(CONFIG_GC, gc, gc.h, gc, GC_init,
		[  --with-gc               enable Boehm's garbage collector])
fi

EL_CONFIG_OPTIONAL_LIBRARY(CONFIG_LZMA, lzma, lzma.h, lzma, lzma_code,
	[  --without-lzma          disable lzma encoding support])

# ===================================================================
# Check for GSSAPI, optional even if installed.
# ===================================================================

enable_gssapi="no";

AC_ARG_WITH(gssapi, [  --with-gssapi           enable GSSAPI support],
            [ if test "x$withval" != xno; then enable_gssapi=yes; fi ])

AC_MSG_CHECKING([for GSSAPI])

if test "$enable_gssapi" = "yes"; then
	AC_MSG_RESULT(yes)
	GSSAPI_CFLAGS=`krb5-config --cflags gssapi`
	GSSAPI_LIBS=`krb5-config --libs gssapi`
	CFLAGS="$GSSAPI_CFLAGS $CFLAGS"
	LIBS="$GSSAPI_LIBS $LIBS"
 	EL_CONFIG(CONFIG_GSSAPI, [GssApi])
else
	AC_MSG_RESULT(no)
fi

AC_SUBST(CONFIG_GSSAPI)

# ===================================================================
# Bookmark and XBEL support
# ===================================================================

EL_SAVE_FLAGS

EL_ARG_ENABLE(CONFIG_BOOKMARKS, bookmarks, [Bookmarks],
	      [  --disable-bookmarks     disable bookmark support])

# Check whether --enable-xbel or --disable-xbel was given.
if test "x${enable_xbel}" != xno; then
	AC_CHECK_HEADERS(expat.h, HAVE_LIBEXPAT=yes, HAVE_LIBEXPAT=no)

	if test "$HAVE_LIBEXPAT" = yes; then
		AC_CHECK_LIB(expat, XML_ParserCreate, HAVE_LIBEXPAT=yes, HAVE_LIBEXPAT=no)
		if test "$HAVE_LIBEXPAT" = yes; then
			LIBS="$LIBS -lexpat"
		fi
	fi
fi


EL_ARG_DEPEND(CONFIG_XBEL_BOOKMARKS, xbel, [CONFIG_BOOKMARKS:yes HAVE_LIBEXPAT:yes],
	      [XBEL bookmarks],
	      [  --disable-xbel          disable XBEL bookmark support (requires expat)])

if test "$CONFIG_XBEL_BOOKMARKS" != yes; then
	EL_RESTORE_FLAGS
fi

# ===================================================================
# Checks for BSD sysmouse
# ===================================================================

HAVE_SYSMOUSE_HEADER="no"

# Either of these header files provides the (same) sysmouse interface
AC_CHECK_HEADERS(sys/consio.h machine/console.h, [HAVE_SYSMOUSE_HEADER="yes"])

# ===================================================================
# Checks for OS/2
# ===================================================================

if test "$CONFIG_OS_OS2" = yes; then
	EL_CONFIG_OS_OS2
fi

# ===================================================================
# Checks for Win32
# ===================================================================

if test "$CONFIG_OS_WIN32" = yes; then
	EL_CONFIG_OS_WIN32
fi

# ===================================================================
# Check for SEE (Simple Ecmascript Engine)
# ===================================================================
AC_ARG_WITH(see, [  --with-see              enable Simple Ecmascript Engine (SEE) support],
            [ if test "x$withval" != xno; then enable_see=yes; fi ])

# The following is probably bad, ugly and so on. Stolen from Guile's (1.4)
# SEE_FLAGS but I really don't want to require people to have Guile in order
# to compile CVS. Also, the macro seems to be really stupid regarding searching
# for Guile in $PATH etc. --pasky

CONFIG_ECMASCRIPT_SEE=no

if test "$enable_see" = "yes"; then
	if test -d "$withval"; then
		SEE_PATH="$withval:$PATH"
	else
		SEE_PATH="$PATH"
	fi

	AC_PATH_PROG(SEE_CONFIG, libsee-config, no, $SEE_PATH)
	AC_MSG_CHECKING([for SEE (2.0.1131 or later)])
	if test "$SEE_CONFIG" != no; then
		EL_SAVE_FLAGS
		SEE_LIBS="`$SEE_CONFIG --libs`"
		SEE_CFLAGS="`$SEE_CONFIG --cppflags`"
		CPPFLAGS="$SEE_CFLAGS $CPPFLAGS"
		LIBS="$SEE_LIBS $LIBS_X"
		AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <see/see.h>]], [[#if SEE_VERSION_API_MAJOR < 2
			#error SEE too old
			#endif
		]])],[cf_result=yes],[cf_result=no])
		EL_RESTORE_FLAGS
		if test "$cf_result" = yes; then
			LIBS="$SEE_LIBS $LIBS"
			EL_CONFIG(CONFIG_ECMASCRIPT_SEE, [SEE])
			AC_SUBST(SEE_CFLAGS)
		fi
		AC_MSG_RESULT($cf_result)
	else
		if test -n "$withval" && test "x$withval" != xno; then
			AC_MSG_ERROR([SEE not found])
		else
			AC_MSG_WARN([SEE support disabled])
		fi
	fi
fi

# ===================================================================
# Check for SpiderMonkey, optional even if installed.
# ===================================================================

AC_ARG_WITH(spidermonkey, [  --without-spidermonkey  disable SpiderMonkey Mozilla JavaScript engine support],
            [if test "$withval" = no; then disable_spidermonkey=yes; fi])
AC_MSG_CHECKING([for SpiderMonkey (1.5 RC3a or later)])

EL_SAVE_FLAGS
cf_result=no

if test -z "$disable_spidermonkey"; then
	if test ! -d "$withval"; then
		withval="";
	fi
	for spidermonkeydir in "$withval" "" /usr /usr/local /opt/spidermonkey /opt/js; do
		for spidermonkeyinclude in "/include" "/include/js" "/include/smjs" "/include/mozjs"; do
			for spidermonkeylib in js smjs mozjs; do
				if test "$cf_result" = no &&
				   test -f "$spidermonkeydir$spidermonkeyinclude/jsapi.h"; then
					SPIDERMONKEY_LIBS="-L$spidermonkeydir/lib -l$spidermonkeylib"
					SPIDERMONKEY_CFLAGS="-I$spidermonkeydir$spidermonkeyinclude"

					LIBS="$SPIDERMONKEY_LIBS $LIBS_X"
					CFLAGS="$CFLAGS_X $SPIDERMONKEY_CFLAGS"
					CPPFLAGS="$CPPFLAGS_X $SPIDERMONKEY_CFLAGS"

					AC_LINK_IFELSE([AC_LANG_PROGRAM([[#define XP_UNIX
						     #include <jsapi.h>]], [[JS_GetReservedSlot(NULL, NULL, 0, NULL)]])],[cf_result=yes],[cf_result=no])
				fi
			done
		done
	done
fi

AC_MSG_RESULT($cf_result)
CONFIG_SPIDERMONKEY="$cf_result"
EL_RESTORE_FLAGS

if test "x$CONFIG_SPIDERMONKEY" = xyes &&
   test "x$CONFIG_ECMASCRIPT_SEE" != xyes; then
	EL_CONFIG(CONFIG_ECMASCRIPT_SMJS, [SpiderMonkey document scripting])
else
	CONFIG_ECMASCRIPT_SMJS=no
fi

EL_CONFIG_DEPENDS(CONFIG_ECMASCRIPT, [CONFIG_ECMASCRIPT_SEE CONFIG_ECMASCRIPT_SMJS], [ECMAScript (JavaScript)])
AC_SUBST(CONFIG_ECMASCRIPT_SEE)
AC_SUBST(CONFIG_ECMASCRIPT_SMJS)


# ===================================================================
# Optional Spidermonkey-based ECMAScript browser scripting
# ===================================================================

AC_ARG_ENABLE(sm-scripting,
	      [  --disable-sm-scripting  ECMAScript browser scripting (requires Spidermonkey)],
	      [if test "$enableval" != no; then enableval="yes"; fi
	       CONFIG_SCRIPTING_SPIDERMONKEY="$enableval";])

if test "x$CONFIG_SPIDERMONKEY" = xyes &&
   test "x$CONFIG_SCRIPTING_SPIDERMONKEY" = xyes; then
	EL_CONFIG(CONFIG_SCRIPTING_SPIDERMONKEY, [SpiderMonkey])
else
	CONFIG_SCRIPTING_SPIDERMONKEY=no
fi

if test "x$CONFIG_ECMASCRIPT_SMJS" = xyes ||
   test "x$CONFIG_SCRIPTING_SPIDERMONKEY" = xyes; then
	LIBS="$LIBS $SPIDERMONKEY_LIBS"
	AC_SUBST(SPIDERMONKEY_LIBS)
	AC_SUBST(SPIDERMONKEY_CFLAGS)
	AC_SUBST(CONFIG_SPIDERMONKEY)
fi

# ===================================================================
# Check for Guile, optional even if installed.
# ===================================================================

enable_guile="no";

AC_ARG_WITH(guile, [  --with-guile            enable Guile support],
            [ if test "x$withval" != xno; then enable_guile=yes; fi ])

# The following is probably bad, ugly and so on. Stolen from Guile's (1.4)
# GUILE_FLAGS but I really don't want to require people to have Guile in order
# to compile CVS. Also, the macro seems to be really stupid regarding searching
# for Guile in $PATH etc. --pasky

AC_MSG_CHECKING([for Guile])

if test "$enable_guile" = "yes"; then
	AC_MSG_RESULT(yes);
	## Based on the GUILE_FLAGS macro.

	if test -d "$withval"; then
		GUILE_PATH="$withval:$PATH"
	else
		GUILE_PATH="$PATH"
	fi

	AC_PATH_PROG(GUILE_CONFIG, guile-config, no, $GUILE_PATH)

	## First, let's just see if we can find Guile at all.
	if test "$GUILE_CONFIG" != no; then
		cf_result="yes";

		GUILE_LIBS="`guile-config link`"
		GUILE_CFLAGS="`guile-config compile`"
		LIBS="$GUILE_LIBS $LIBS"
		EL_CONFIG(CONFIG_SCRIPTING_GUILE, [Guile])
		AC_SUBST(GUILE_CFLAGS)
		cat <<EOF
***********************************************************************
The Guile support is incomplete and not so well integrated to ELinks
yet. That means, e.g., that you have no Guile console and there might
not be all the necessary hooks. Also, the Guile interface is not too
well tested (success stories heartily welcomed!).  See
src/scripting/guile/README for further details and hints.
***********************************************************************
EOF
	else
		if test -n "$withval" && test "x$withval" != xno; then
			AC_MSG_ERROR([Guile not found])
		else
			AC_MSG_WARN([Guile support disabled])
		fi
	fi
else
	AC_MSG_RESULT(no);
fi

# ===================================================================
# Check for Perl
# ===================================================================
enable_perl="no";

AC_ARG_WITH(perl, [  --with-perl             enable Perl support],
            [
if test "$withval" = yes; then
	# FIXME: If withval is a valid directory append it to PATH
	# so that you can specify one of several perl installations.
	withval="";
	enable_perl=yes;
fi
	    ])

AC_MSG_CHECKING([for Perl])

cf_result=no

EL_SAVE_FLAGS

if test "$enable_perl" = "yes"; then
	PERL_LIBS="`perl -MExtUtils::Embed -e ldopts`"
	PERL_CFLAGS="`perl -MExtUtils::Embed -e ccopts`"
	LIBS="$PERL_LIBS $LIBS"
	CFLAGS="$PERL_CFLAGS $CFLAGS"
	CPPFLAGS="$CPPFLAGS $PERL_CFLAGS"
	AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <EXTERN.h>
#include <perl.h>
#include <perlapi.h>
]], [[PerlInterpreter *my_perl = perl_alloc();]])],[cf_result=yes],[cf_result=no])
fi

if test "$cf_result"; then AC_MSG_RESULT($cf_result); fi

AC_MSG_CHECKING([whether POPpx works without an n_a variable])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <EXTERN.h>
#include <perl.h>
extern PerlInterpreter *my_perl;
]], [[dSP; (void) POPpx;]])],[AC_MSG_RESULT([yes])
AC_DEFINE([CONFIG_PERL_POPPX_WITHOUT_N_A], [1],
		[Define if using Perl 5.8.8 or later, where the "POPpx" macro
no longer needs an "n_a" variable like it did in 5.8.7])],[AC_MSG_RESULT([no])])

if test "$cf_result" != "yes"; then
	EL_RESTORE_FLAGS
else
	EL_CONFIG(CONFIG_SCRIPTING_PERL, [Perl])

	CFLAGS="$CFLAGS_X"
	CPPFLAGS="$CPPFLAGS_X"
	AC_SUBST(PERL_LIBS)
	AC_SUBST(PERL_CFLAGS)
fi

# ===================================================================
# Check for Python
# ===================================================================
enable_python="no";

AC_ARG_WITH(python, [[  --with-python[=DIR]     enable Python support]],
            [ if test "x$withval" != xno; then enable_python=yes; fi ])

EL_SAVE_FLAGS
cf_result=no

AC_MSG_CHECKING([for Python])

if test "$enable_python" = "yes"; then
	AC_MSG_RESULT(yes);

	if test -d "$withval"; then
		PYTHON_PATH="$withval:$PATH"
	else
		PYTHON_PATH="$PATH"
	fi

	AC_PATH_PROG(PYTHON, python, no, $PYTHON_PATH)

	if test "$PYTHON" != no; then
		cf_result="yes";

		PYTHON_CFLAGS="`$PYTHON -c 'from distutils import sysconfig; print "-I%s -I%s" % (sysconfig.get_python_inc(), sysconfig.get_python_inc(plat_specific=True))'`"
		PYTHON_LIBS="`$PYTHON -c 'from distutils import sysconfig; var = sysconfig.get_config_var; print "%s %s %s -L%s -lpython%s" % (var("LINKFORSHARED"), var("LIBS"), var("SYSLIBS"), var("LIBPL"), var("VERSION"))'`"
		LIBS="$PYTHON_LIBS $LIBS"
		CPPFLAGS="$CPPFLAGS $PYTHON_CFLAGS"
		AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <Python.h>]], [[Py_Initialize();]])],[cf_result=yes],[cf_result=no])

		if test "$cf_result" != "yes"; then
			EL_RESTORE_FLAGS
		else
			EL_CONFIG(CONFIG_SCRIPTING_PYTHON, [Python])
			AC_SUBST(PYTHON_LIBS)
			AC_SUBST(PYTHON_CFLAGS)
			CPPFLAGS="$CPPFLAGS_X"
			cat <<EOF
***********************************************************************
The Python support is incomplete and not so well integrated to ELinks
yet. That means, e.g., that you have no Python console and there might
not be all the necessary hooks. Also, the Python interface is not too
well tested (success stories heartily welcomed!).
***********************************************************************
EOF
		fi
	else
		if test -n "$withval" && test "x$withval" != xno; then
			AC_MSG_ERROR([Python not found])
		else
			AC_MSG_WARN([Python support disabled])
		fi
	fi
else
	AC_MSG_RESULT(no);
fi


# ===================================================================
# Check for Lua, optional even if installed.
# ===================================================================

# Do this the long way, as FreeBSD reportedly needs -L<dir> for
# anything other than /usr/lib, and Lua is very often in /usr/local/lib.

AC_ARG_WITH(lua, [  --without-lua           disable Lua support],
            [if test "$withval" = no; then disable_lua=yes; fi])
AC_MSG_CHECKING([for Lua])

EL_SAVE_FLAGS
cf_result=no

if test -z "$disable_lua"; then
	if test ! -d "$withval"; then
		withval="";
	fi
	for luadir in "$withval" "" /usr /usr/local; do
		for suffix in "" 50; do
			if test "$cf_result" = no && ( test -f "$luadir/include/lua.h" || \
			   test -f "$luadir/include/lua$suffix/lua.h" ) ; then