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#     * /usr/local/include/lua/X.Y
#     * /usr/local/include/luaXY
#
#   (Where X.Y is the Lua version number, e.g. 5.1.)
#
#   The Lua version number found in the headers is always checked to match
#   the Lua interpreter's version number. Lua headers with mismatched
#   version numbers are not accepted.
#
#   If headers are found, then ACTION-IF-FOUND is performed, otherwise
#   ACTION-IF-NOT-FOUND is performed. If ACTION-IF-NOT-FOUND is blank, then
#   it will default to printing an error. To prevent the default behavior,
#   set the action to ':'.
#
#   AX_LUA_LIBS: Search for Lua libraries. Requires that AX_PROG_LUA be
#   expanded before this macro. Adds precious variable LUA_LIB, which may
#   contain Lua specific linker flags, e.g. -llua5.1. If LUA_LIB is blank,
#   then this macro will attempt to find suitable flags.
#
#   LUA_LIB can be used by Automake to link Lua modules or executables with
#   embedded interpreters. The *_LIBADD and *_LDADD variables should be used
#   for this purpose, e.g. mymod_LIBADD = $(LUA_LIB).
#
#   This macro searches for the Lua library. More technically, it searches
#   for a library containing the function lua_load. The search is performed
#   with a combination of LIBS, LIBRARY_PATH, and LUA_LIB.
#
#   If the search determines that some linker flags are missing, then those
#   flags will be added to LUA_LIB.
#
#   If libraries are found, then ACTION-IF-FOUND is performed, otherwise
#   ACTION-IF-NOT-FOUND is performed. If ACTION-IF-NOT-FOUND is blank, then
#   it will default to printing an error. To prevent the default behavior,
#   set the action to ':'.
#
#   AX_LUA_READLINE: Search for readline headers and libraries. Requires the
#   AX_LIB_READLINE macro, which is provided by ax_lib_readline.m4 from the
#   Autoconf Archive.
#
#   If a readline compatible library is found, then ACTION-IF-FOUND is
#   performed, otherwise ACTION-IF-NOT-FOUND is performed.
#
# LICENSE
#
#   Copyright (c) 2015 Reuben Thomas <rrt@sc3d.org>
#   Copyright (c) 2014 Tim Perkins <tprk77@gmail.com>
#
#   This program is free software: you can redistribute it and/or modify it
#   under the terms of the GNU General Public License as published by the
#   Free Software Foundation, either version 3 of the License, or (at your
#   option) any later version.
#
#   This program is distributed in the hope that it will be useful, but
#   WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
#   Public License for more details.
#
#   You should have received a copy of the GNU General Public License along
#   with this program. If not, see <http://www.gnu.org/licenses/>.
#
#   As a special exception, the respective Autoconf Macro's copyright owner
#   gives unlimited permission to copy, distribute and modify the configure
#   scripts that are the output of Autoconf when processing the Macro. You
#   need not follow the terms of the GNU General Public License when using
#   or distributing such scripts, even though portions of the text of the
#   Macro appear in them. The GNU General Public License (GPL) does govern
#   all other use of the material that constitutes the Autoconf Macro.
#
#   This special exception to the GPL applies to versions of the Autoconf
#   Macro released by the Autoconf Archive. When you make and distribute a
#   modified version of the Autoconf Macro, you may extend this special
#   exception to the GPL to apply to your modified version as well.

#serial 39

dnl =========================================================================
dnl AX_PROG_LUA([MINIMUM-VERSION], [TOO-BIG-VERSION],
dnl             [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
dnl =========================================================================
AC_DEFUN([AX_PROG_LUA],
[
  dnl Check for required tools.
  AC_REQUIRE([AC_PROG_GREP])
  AC_REQUIRE([AC_PROG_SED])

  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 lua5.3 lua53 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'

    AS_IF([test "x$LUA" != 'x:'],
      [ 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"],