[med-svn] [cnrun] 03/06: carry an ax_lua.m4 that's new enough

andrei zavada hmmr-guest at moszumanska.debian.org
Tue Nov 25 09:43:33 UTC 2014


This is an automated email from the git hooks/post-receive script.

hmmr-guest pushed a commit to branch master
in repository cnrun.

commit 19c652b86cce7dd8aafea4bd6aa44bb77709f371
Author: Andrei Zavada <johnhommer at gmail.com>
Date:   Tue Nov 25 00:31:37 2014 +0200

    carry an ax_lua.m4 that's new enough
---
 debian/unwanted-files |   5 +-
 upstream/Makefile.am  |   3 +-
 upstream/configure.ac |  16 +-
 upstream/m4/ax_lua.m4 | 441 ++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 457 insertions(+), 8 deletions(-)

diff --git a/debian/unwanted-files b/debian/unwanted-files
index 8ddf06f..75788c3 100644
--- a/debian/unwanted-files
+++ b/debian/unwanted-files
@@ -1,4 +1,7 @@
-m4/*
+m4/libtool.m4
+m4/ltoptions.m4
+m4/ltsugar.m4
+m4/ltversion.m4
 aclocal.m4
 config.sub
 ltmain.sh
diff --git a/upstream/Makefile.am b/upstream/Makefile.am
index 98fd85d..1b4d752 100644
--- a/upstream/Makefile.am
+++ b/upstream/Makefile.am
@@ -6,7 +6,8 @@ SUBDIRS := src doc
 EXTRA_DIST = \
 	ChangeLog \
 	autogen.sh \
-	libcnrun.pc.in
+	libcnrun.pc.in \
+	m4/ax_lua.m4
 
 if DO_TOOLS
 man_MANS = \
diff --git a/upstream/configure.ac b/upstream/configure.ac
index 60a80cc..201786a 100644
--- a/upstream/configure.ac
+++ b/upstream/configure.ac
@@ -57,14 +57,16 @@ AC_OPENMP()
 
 PKG_CHECK_MODULES([LIBCN], [gsl libxml-2.0])
 
-AX_PROG_LUA([5.1], [5.3],)
-AX_LUA_LIBS
-AX_LUA_HEADERS
+#AX_PROG_LUA([5.1], [5.3],)
+# we carry own copy of ax_lua.m4, with suffixed macros to differentiate those from standard ones
+AX_PROG_LUA2014(,,)
+AX_LUA_LIBS2014
+AX_LUA_HEADERS2014
 dnl we cannot do strcmp in cpp, so here's bash to the rescue
-if test x"$LUA_VERSION" = x"5.1"; then
-   AC_DEFINE([HAVE_LUA_51], [], ["Do we have lua 5.1?"])
-else
+if test x"$LUA_VERSION" = x"5.2"; then
    AC_DEFINE([HAVE_LUA_52], [], ["Do we have lua 5.2?"])
+else
+   AC_DEFINE([HAVE_LUA_51], [], ["Do we have lua 5.1?"])
 fi
 
 AC_ARG_ENABLE(
@@ -98,6 +100,8 @@ AC_MSG_RESULT([
    CXXFLAGS:            $CXXFLAGS
    LDFLAGS:             $LDFLAGS
 
+   LUA:                 $LUA_VERSION (execdir: $luaexecdir)
+
    build tools:		${do_tools}
 
 ])
diff --git a/upstream/m4/ax_lua.m4 b/upstream/m4/ax_lua.m4
new file mode 100644
index 0000000..8c4869e
--- /dev/null
+++ b/upstream/m4/ax_lua.m4
@@ -0,0 +1,441 @@
+# this file is time-warped here from 2014
+# it has the principal macros renamed with a suffix 2014, to
+# distinguish those from the standard ones that would be normally be
+# used instead.
+
+# Below is the original content of ax_lua.m4 in the version current as of 2014-11-24,
+# with prefatory comment stripped and with "2014" appended to the names of the following macros:
+#   AX_PROG_LUA
+#   AX_LUA_HEADERS
+#   AX_LUA_LIBS
+
+
+#serial 22
+
+dnl =========================================================================
+dnl AX_PROG_LUA([MINIMUM-VERSION], [TOO-BIG-VERSION],
+dnl             [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+dnl =========================================================================
+AC_DEFUN([AX_PROG_LUA2014],
+[
+  dnl Make LUA a precious variable.
+  AC_ARG_VAR([LUA], [The Lua interpreter, e.g. /usr/bin/lua5.1])
+
+  dnl Find a Lua interpreter.
+  m4_define_default([_AX_LUA_INTERPRETER_LIST],
+    [lua lua5.2 lua52 lua5.1 lua51 lua50])
+
+  m4_if([$1], [],
+  [ dnl No version check is needed. Find any Lua interpreter.
+    AS_IF([test "x$LUA" = 'x'],
+      [AC_PATH_PROGS([LUA], [_AX_LUA_INTERPRETER_LIST], [:])])
+    ax_display_LUA='lua'
+
+    dnl At least check if this is a Lua interpreter.
+    AC_MSG_CHECKING([if $LUA is a Lua interpreter])
+    _AX_LUA_CHK_IS_INTRP([$LUA],
+      [AC_MSG_RESULT([yes])],
+      [ AC_MSG_RESULT([no])
+        AC_MSG_ERROR([not a Lua interpreter])
+      ])
+  ],
+  [ dnl A version check is needed.
+    AS_IF([test "x$LUA" != 'x'],
+    [ dnl Check if this is a Lua interpreter.
+      AC_MSG_CHECKING([if $LUA is a Lua interpreter])
+      _AX_LUA_CHK_IS_INTRP([$LUA],
+        [AC_MSG_RESULT([yes])],
+        [ AC_MSG_RESULT([no])
+          AC_MSG_ERROR([not a Lua interpreter])
+        ])
+      dnl Check the version.
+      m4_if([$2], [],
+        [_ax_check_text="whether $LUA version >= $1"],
+        [_ax_check_text="whether $LUA version >= $1, < $2"])
+      AC_MSG_CHECKING([$_ax_check_text])
+      _AX_LUA_CHK_VER([$LUA], [$1], [$2],
+        [AC_MSG_RESULT([yes])],
+        [ AC_MSG_RESULT([no])
+          AC_MSG_ERROR([version is out of range for specified LUA])])
+      ax_display_LUA=$LUA
+    ],
+    [ dnl Try each interpreter until we find one that satisfies VERSION.
+      m4_if([$2], [],
+        [_ax_check_text="for a Lua interpreter with version >= $1"],
+        [_ax_check_text="for a Lua interpreter with version >= $1, < $2"])
+      AC_CACHE_CHECK([$_ax_check_text],
+        [ax_cv_pathless_LUA],
+        [ for ax_cv_pathless_LUA in _AX_LUA_INTERPRETER_LIST none; do
+            test "x$ax_cv_pathless_LUA" = 'xnone' && break
+            _AX_LUA_CHK_IS_INTRP([$ax_cv_pathless_LUA], [], [continue])
+            _AX_LUA_CHK_VER([$ax_cv_pathless_LUA], [$1], [$2], [break])
+          done
+        ])
+      dnl Set $LUA to the absolute path of $ax_cv_pathless_LUA.
+      AS_IF([test "x$ax_cv_pathless_LUA" = 'xnone'],
+        [LUA=':'],
+        [AC_PATH_PROG([LUA], [$ax_cv_pathless_LUA])])
+      ax_display_LUA=$ax_cv_pathless_LUA
+    ])
+  ])
+
+  AS_IF([test "x$LUA" = 'x:'],
+  [ dnl Run any user-specified action, or abort.
+    m4_default([$4], [AC_MSG_ERROR([cannot find suitable Lua interpreter])])
+  ],
+  [ dnl Query Lua for its version number.
+    AC_CACHE_CHECK([for $ax_display_LUA version], [ax_cv_lua_version],
+      [ ax_cv_lua_version=`$LUA -e "print(_VERSION)" | \
+          sed "s|^Lua \(.*\)|\1|" | \
+          grep -E -o "^@<:@0-9@:>@+\.@<:@0-9@:>@+"`
+      ])
+    AS_IF([test "x$ax_cv_lua_version" = 'x'],
+      [AC_MSG_ERROR([invalid Lua version number])])
+    AC_SUBST([LUA_VERSION], [$ax_cv_lua_version])
+    AC_SUBST([LUA_SHORT_VERSION], [`echo "$LUA_VERSION" | sed 's|\.||'`])
+
+    dnl The following check is not supported:
+    dnl At times (like when building shared libraries) you may want to know
+    dnl which OS platform Lua thinks this is.
+    AC_CACHE_CHECK([for $ax_display_LUA platform], [ax_cv_lua_platform],
+      [ax_cv_lua_platform=`$LUA -e "print('unknown')"`])
+    AC_SUBST([LUA_PLATFORM], [$ax_cv_lua_platform])
+
+    dnl Use the values of $prefix and $exec_prefix for the corresponding
+    dnl values of LUA_PREFIX and LUA_EXEC_PREFIX. These are made distinct
+    dnl variables so they can be overridden if need be. However, the general
+    dnl consensus is that you shouldn't need this ability.
+    AC_SUBST([LUA_PREFIX], ['${prefix}'])
+    AC_SUBST([LUA_EXEC_PREFIX], ['${exec_prefix}'])
+
+    dnl Lua provides no way to query the script directory, and instead
+    dnl provides LUA_PATH. However, we should be able to make a safe educated
+    dnl guess. If the built-in search path contains a directory which is
+    dnl prefixed by $prefix, then we can store scripts there. The first
+    dnl matching path will be used.
+    AC_CACHE_CHECK([for $ax_display_LUA script directory],
+      [ax_cv_lua_luadir],
+      [ AS_IF([test "x$prefix" = 'xNONE'],
+          [ax_lua_prefix=$ac_default_prefix],
+          [ax_lua_prefix=$prefix])
+
+        dnl Initialize to the default path.
+        ax_cv_lua_luadir="$LUA_PREFIX/share/lua/$LUA_VERSION"
+
+        dnl Try to find a path with the prefix.
+        _AX_LUA_FND_PRFX_PTH([$LUA], [$ax_lua_prefix], [package.path])
+        AS_IF([test "x$ax_lua_prefixed_path" != 'x'],
+        [ dnl Fix the prefix.
+          _ax_strip_prefix=`echo "$ax_lua_prefix" | sed 's|.|.|g'`
+          ax_cv_lua_luadir=`echo "$ax_lua_prefixed_path" | \
+            sed "s,^$_ax_strip_prefix,$LUA_PREFIX,"`
+        ])
+      ])
+    AC_SUBST([luadir], [$ax_cv_lua_luadir])
+    AC_SUBST([pkgluadir], [\${luadir}/$PACKAGE])
+
+    dnl Lua provides no way to query the module directory, and instead
+    dnl provides LUA_PATH. However, we should be able to make a safe educated
+    dnl guess. If the built-in search path contains a directory which is
+    dnl prefixed by $exec_prefix, then we can store modules there. The first
+    dnl matching path will be used.
+    AC_CACHE_CHECK([for $ax_display_LUA module directory],
+      [ax_cv_lua_luaexecdir],
+      [ AS_IF([test "x$exec_prefix" = 'xNONE'],
+          [ax_lua_exec_prefix=$ax_lua_prefix],
+          [ax_lua_exec_prefix=$exec_prefix])
+
+        dnl Initialize to the default path.
+        ax_cv_lua_luaexecdir="$LUA_EXEC_PREFIX/lib/lua/$LUA_VERSION"
+
+        dnl Try to find a path with the prefix.
+        _AX_LUA_FND_PRFX_PTH([$LUA],
+          [$ax_lua_exec_prefix], [package.cpathd])
+        AS_IF([test "x$ax_lua_prefixed_path" != 'x'],
+        [ dnl Fix the prefix.
+          _ax_strip_prefix=`echo "$ax_lua_exec_prefix" | sed 's|.|.|g'`
+          ax_cv_lua_luaexecdir=`echo "$ax_lua_prefixed_path" | \
+            sed "s,^$_ax_strip_prefix,$LUA_EXEC_PREFIX,"`
+        ])
+      ])
+    AC_SUBST([luaexecdir], [$ax_cv_lua_luaexecdir])
+    AC_SUBST([pkgluaexecdir], [\${luaexecdir}/$PACKAGE])
+
+    dnl Run any user specified action.
+    $3
+  ])
+])
+
+dnl AX_WITH_LUA is now the same thing as AX_PROG_LUA.
+AC_DEFUN([AX_WITH_LUA],
+[
+  AC_MSG_WARN([[$0 is deprecated, please use AX_PROG_LUA]])
+  AX_PROG_LUA
+])
+
+
+dnl =========================================================================
+dnl _AX_LUA_CHK_IS_INTRP(PROG, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
+dnl =========================================================================
+AC_DEFUN([_AX_LUA_CHK_IS_INTRP],
+[
+  dnl Just print _VERSION because all Lua interpreters have this global.
+  AS_IF([$1 -e "print('Hello ' .. _VERSION .. '!')" &>/dev/null],
+    [$2], [$3])
+])
+
+
+dnl =========================================================================
+dnl _AX_LUA_CHK_VER(PROG, MINIMUM-VERSION, [TOO-BIG-VERSION],
+dnl                 [ACTION-IF-TRUE], [ACTION-IF-FALSE])
+dnl =========================================================================
+AC_DEFUN([_AX_LUA_CHK_VER],
+[
+  _ax_test_ver=`$1 -e "print(_VERSION)" 2>/dev/null | \
+    sed "s|^Lua \(.*\)|\1|" | grep -E -o "^@<:@0-9@:>@+\.@<:@0-9@:>@+"`
+  AS_IF([test "x$_ax_test_ver" = 'x'],
+    [_ax_test_ver='0'])
+  AX_COMPARE_VERSION([$_ax_test_ver], [ge], [$2])
+  m4_if([$3], [], [],
+    [ AS_IF([$ax_compare_version],
+        [AX_COMPARE_VERSION([$_ax_test_ver], [lt], [$3])])
+    ])
+  AS_IF([$ax_compare_version], [$4], [$5])
+])
+
+
+dnl =========================================================================
+dnl _AX_LUA_FND_PRFX_PTH(PROG, PREFIX, LUA-PATH-VARIABLE)
+dnl =========================================================================
+AC_DEFUN([_AX_LUA_FND_PRFX_PTH],
+[
+  dnl Invokes the Lua interpreter PROG to print the path variable
+  dnl LUA-PATH-VARIABLE, usually package.path or package.cpath. Paths are
+  dnl then matched against PREFIX. The first path to begin with PREFIX is set
+  dnl to ax_lua_prefixed_path.
+
+  ax_lua_prefixed_path=''
+  _ax_package_paths=`$1 -e 'print($3)' 2>/dev/null | sed 's|;|\n|g'`
+  dnl Try the paths in order, looking for the prefix.
+  for _ax_package_path in $_ax_package_paths; do
+    dnl Copy the path, up to the use of a Lua wildcard.
+    _ax_path_parts=`echo "$_ax_package_path" | sed 's|/|\n|g'`
+    _ax_reassembled=''
+    for _ax_path_part in $_ax_path_parts; do
+      echo "$_ax_path_part" | grep '\?' >/dev/null && break
+      _ax_reassembled="$_ax_reassembled/$_ax_path_part"
+    done
+    dnl Check the path against the prefix.
+    _ax_package_path=$_ax_reassembled
+    if echo "$_ax_package_path" | grep "^$2" >/dev/null; then
+      dnl Found it.
+      ax_lua_prefixed_path=$_ax_package_path
+      break
+    fi
+  done
+])
+
+
+dnl =========================================================================
+dnl AX_LUA_HEADERS([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+dnl =========================================================================
+AC_DEFUN([AX_LUA_HEADERS2014],
+[
+  dnl Check for LUA_VERSION.
+  AC_MSG_CHECKING([if LUA_VERSION is defined])
+  AS_IF([test "x$LUA_VERSION" != 'x'],
+    [AC_MSG_RESULT([yes])],
+    [ AC_MSG_RESULT([no])
+      AC_MSG_ERROR([cannot check Lua headers without knowing LUA_VERSION])
+    ])
+
+  dnl Make LUA_INCLUDE a precious variable.
+  AC_ARG_VAR([LUA_INCLUDE], [The Lua includes, e.g. -I/usr/include/lua5.1])
+
+  dnl Some default directories to search.
+  LUA_SHORT_VERSION=`echo "$LUA_VERSION" | sed 's|\.||'`
+  m4_define_default([_AX_LUA_INCLUDE_LIST],
+    [ /usr/include/lua$LUA_VERSION \
+      /usr/include/lua/$LUA_VERSION \
+      /usr/include/lua$LUA_SHORT_VERSION \
+      /usr/local/include/lua$LUA_VERSION \
+      /usr/local/include/lua-$LUA_VERSION \
+      /usr/local/include/lua/$LUA_VERSION \
+      /usr/local/include/lua$LUA_SHORT_VERSION \
+    ])
+
+  dnl Try to find the headers.
+  _ax_lua_saved_cppflags=$CPPFLAGS
+  CPPFLAGS="$CPPFLAGS $LUA_INCLUDE"
+  AC_CHECK_HEADERS([lua.h lualib.h lauxlib.h luaconf.h])
+  CPPFLAGS=$_ax_lua_saved_cppflags
+
+  dnl Try some other directories if LUA_INCLUDE was not set.
+  AS_IF([test "x$LUA_INCLUDE" = 'x' &&
+         test "x$ac_cv_header_lua_h" != 'xyes'],
+    [ dnl Try some common include paths.
+      for _ax_include_path in _AX_LUA_INCLUDE_LIST; do
+        test ! -d "$_ax_include_path" && continue
+
+        AC_MSG_CHECKING([for Lua headers in])
+        AC_MSG_RESULT([$_ax_include_path])
+
+        AS_UNSET([ac_cv_header_lua_h])
+        AS_UNSET([ac_cv_header_lualib_h])
+        AS_UNSET([ac_cv_header_lauxlib_h])
+        AS_UNSET([ac_cv_header_luaconf_h])
+
+        _ax_lua_saved_cppflags=$CPPFLAGS
+        CPPFLAGS="$CPPFLAGS -I$_ax_include_path"
+        AC_CHECK_HEADERS([lua.h lualib.h lauxlib.h luaconf.h])
+        CPPFLAGS=$_ax_lua_saved_cppflags
+
+        AS_IF([test "x$ac_cv_header_lua_h" = 'xyes'],
+          [ LUA_INCLUDE="-I$_ax_include_path"
+            break
+          ])
+      done
+    ])
+
+  AS_IF([test "x$ac_cv_header_lua_h" = 'xyes'],
+    [ dnl Make a program to print LUA_VERSION defined in the header.
+      dnl TODO This probably shouldn't be a runtime test.
+
+      AC_CACHE_CHECK([for Lua header version],
+        [ax_cv_lua_header_version],
+        [ _ax_lua_saved_cppflags=$CPPFLAGS
+          CPPFLAGS="$CPPFLAGS $LUA_INCLUDE"
+          AC_RUN_IFELSE(
+            [ AC_LANG_SOURCE([[
+#include <lua.h>
+#include <stdlib.h>
+#include <stdio.h>
+int main(int argc, char ** argv)
+{
+  if(argc > 1) printf("%s", LUA_VERSION);
+  exit(EXIT_SUCCESS);
+}
+]])
+            ],
+            [ ax_cv_lua_header_version=`./conftest$EXEEXT p | \
+                sed "s|^Lua \(.*\)|\1|" | \
+                grep -E -o "^@<:@0-9@:>@+\.@<:@0-9@:>@+"`
+            ],
+            [ax_cv_lua_header_version='unknown'])
+          CPPFLAGS=$_ax_lua_saved_cppflags
+        ])
+
+      dnl Compare this to the previously found LUA_VERSION.
+      AC_MSG_CHECKING([if Lua header version matches $LUA_VERSION])
+      AS_IF([test "x$ax_cv_lua_header_version" = "x$LUA_VERSION"],
+        [ AC_MSG_RESULT([yes])
+          ax_header_version_match='yes'
+        ],
+        [ AC_MSG_RESULT([no])
+          ax_header_version_match='no'
+        ])
+    ])
+
+  dnl Was LUA_INCLUDE specified?
+  AS_IF([test "x$ax_header_version_match" != 'xyes' &&
+         test "x$LUA_INCLUDE" != 'x'],
+    [AC_MSG_ERROR([cannot find headers for specified LUA_INCLUDE])])
+
+  dnl Test the final result and run user code.
+  AS_IF([test "x$ax_header_version_match" = 'xyes'], [$1],
+    [m4_default([$2], [AC_MSG_ERROR([cannot find Lua includes])])])
+])
+
+dnl AX_LUA_HEADERS_VERSION no longer exists, use AX_LUA_HEADERS.
+AC_DEFUN([AX_LUA_HEADERS_VERSION],
+[
+  AC_MSG_WARN([[$0 is deprecated, please use AX_LUA_HEADERS]])
+])
+
+
+dnl =========================================================================
+dnl AX_LUA_LIBS([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+dnl =========================================================================
+AC_DEFUN([AX_LUA_LIBS2014],
+[
+  dnl TODO Should this macro also check various -L flags?
+
+  dnl Check for LUA_VERSION.
+  AC_MSG_CHECKING([if LUA_VERSION is defined])
+  AS_IF([test "x$LUA_VERSION" != 'x'],
+    [AC_MSG_RESULT([yes])],
+    [ AC_MSG_RESULT([no])
+      AC_MSG_ERROR([cannot check Lua libs without knowing LUA_VERSION])
+    ])
+
+  dnl Make LUA_LIB a precious variable.
+  AC_ARG_VAR([LUA_LIB], [The Lua library, e.g. -llua5.1])
+
+  AS_IF([test "x$LUA_LIB" != 'x'],
+  [ dnl Check that LUA_LIBS works.
+    _ax_lua_saved_libs=$LIBS
+    LIBS="$LIBS $LUA_LIB"
+    AC_SEARCH_LIBS([lua_load], [],
+      [_ax_found_lua_libs='yes'],
+      [_ax_found_lua_libs='no'])
+    LIBS=$_ax_lua_saved_libs
+
+    dnl Check the result.
+    AS_IF([test "x$_ax_found_lua_libs" != 'xyes'],
+      [AC_MSG_ERROR([cannot find libs for specified LUA_LIB])])
+  ],
+  [ dnl First search for extra libs.
+    _ax_lua_extra_libs=''
+
+    _ax_lua_saved_libs=$LIBS
+    LIBS="$LIBS $LUA_LIB"
+    AC_SEARCH_LIBS([exp], [m])
+    AC_SEARCH_LIBS([dlopen], [dl])
+    LIBS=$_ax_lua_saved_libs
+
+    AS_IF([test "x$ac_cv_search_exp" != 'xno' &&
+           test "x$ac_cv_search_exp" != 'xnone required'],
+      [_ax_lua_extra_libs="$_ax_lua_extra_libs $ac_cv_search_exp"])
+
+    AS_IF([test "x$ac_cv_search_dlopen" != 'xno' &&
+           test "x$ac_cv_search_dlopen" != 'xnone required'],
+      [_ax_lua_extra_libs="$_ax_lua_extra_libs $ac_cv_search_dlopen"])
+
+    dnl Try to find the Lua libs.
+    _ax_lua_saved_libs=$LIBS
+    LIBS="$LIBS $LUA_LIB"
+    AC_SEARCH_LIBS([lua_load],
+                   [ lua$LUA_VERSION \
+                     lua$LUA_SHORT_VERSION \
+                     lua-$LUA_VERSION \
+                     lua-$LUA_SHORT_VERSION \
+                     lua],
+                   [_ax_found_lua_libs='yes'],
+                   [_ax_found_lua_libs='no'],
+                   [$_ax_lua_extra_libs])
+    LIBS=$_ax_lua_saved_libs
+
+    AS_IF([test "x$ac_cv_search_lua_load" != 'xno' &&
+           test "x$ac_cv_search_lua_load" != 'xnone required'],
+      [LUA_LIB="$ac_cv_search_lua_load $_ax_lua_extra_libs"])
+  ])
+
+  dnl Test the result and run user code.
+  AS_IF([test "x$_ax_found_lua_libs" = 'xyes'], [$1],
+    [m4_default([$2], [AC_MSG_ERROR([cannot find Lua libs])])])
+])
+
+
+dnl =========================================================================
+dnl AX_LUA_READLINE([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+dnl =========================================================================
+AC_DEFUN([AX_LUA_READLINE],
+[
+  AX_LIB_READLINE
+  AS_IF([test "x$ac_cv_header_readline_readline_h" != 'x' &&
+         test "x$ac_cv_header_readline_history_h" != 'x'],
+    [ LUA_LIBS_CFLAGS="-DLUA_USE_READLINE $LUA_LIBS_CFLAGS"
+      $1
+    ],
+    [$2])
+])

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