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+# mhd.m4
+
+# This file is part of TALER
+# Copyright (C) 2022 Taler Systems SA
+#
+# TALER 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, or (at your option) any later version.
+#
+# TALER 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
+# TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/license>
+
+# serial 1
+
+dnl MHD_VERSION_AT_LEAST([VERSION])
+dnl
+dnl Check that microhttpd.h can be used to build a program that prints out
+dnl the MHD_VERSION tuple in X.Y.Z format, and that X.Y.Z is greater or equal
+dnl to VERSION. If not, display message and cause the configure script to
+dnl exit failurefully.
+dnl
+dnl This uses AX_COMPARE_VERSION to do the job.
+dnl It sets shell var mhd_cv_version, as well.
+dnl
+AC_DEFUN([MHD_VERSION_AT_LEAST],
+[AC_CACHE_CHECK([libmicrohttpd version],[mhd_cv_version],
+ [AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+ #include <stdio.h>
+ #include <microhttpd.h>
+]],[[
+ int v = MHD_VERSION;
+ printf ("%x.%x.%x\n",
+ (v >> 24) & 0xff,
+ (v >> 16) & 0xff,
+ (v >> 8) & 0xff);
+]])],
+ [mhd_cv_version=$(./conftest)],
+ [mhd_cv_version=0])])
+AX_COMPARE_VERSION([$mhd_cv_version],[ge],[$1],,
+ [AC_MSG_ERROR([[
+***
+*** You need libmicrohttpd >= $1 to build this program.
+*** ]])])])
+
+# mhd.m4 ends here