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diff --git a/m4/ax_check_lib_func.m4 b/m4/ax_check_lib_func.m4
new file mode 100644
index 0000000..1133da7
--- /dev/null
+++ b/m4/ax_check_lib_func.m4
@@ -0,0 +1,27 @@
+# Check if a function is available in a library.
+
+# Copyright (C) 2013  Simon Ruderich
+#
+# 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/>.
+
+AC_DEFUN([AX_CHECK_LIB_FUNC], [
+    AC_CHECK_LIB([$1], [$2], [
+        AC_DEFINE(
+            m4_toupper([HAVE_$2]), 1,
+            [Define to 1 if you have the `$2' function ($1 library).] dnl `
+        )
+    ])
+])
+
+# vim: ft=config