# SPDX-License-Identifier: GPL-2.0

AC_PREREQ([2.61])

AC_INIT([tfortune], [m4_esyscmd_s(./version-gen.sh)],
	[maan@tuebingen.mpg.de], [], [http://people.tuebingen.mpg.de/maan/tfortune/])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_FILES([config.mak])
AC_USE_SYSTEM_EXTENSIONS
AC_PROG_CC
AC_PROG_CPP

AC_DEFUN([REQUIRE_EXECUTABLE], [
	AC_PATH_PROG(m4_toupper([$1]), [$1])
	test -z "$m4_toupper([$1])" && AC_MSG_ERROR([$1 is required])
])
REQUIRE_EXECUTABLE([flex])
REQUIRE_EXECUTABLE([bison])
REQUIRE_EXECUTABLE([lopsubgen])

HAVE_LOPSUB=yes
AC_CHECK_HEADER(lopsub.h, [], [HAVE_LOPSUB=no])
AC_CHECK_LIB([lopsub], [lls_merge], [], [HAVE_LOPSUB=no])
if test $HAVE_LOPSUB = no; then AC_MSG_ERROR([
	The lopsub library is required to build this software, but
	the above checks indicate it is not installed on your system.
	Run the following command to download a copy.
		git clone git://git.tuebingen.mpg.de/lopsub.git
	Install the library, then run this configure script again.
])
fi
AC_OUTPUT