diff --git a/configure.ac b/configure.ac
index 478b026..6475c2e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,7 +19,7 @@ AC_PROG_CPP
 AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_MAKE_SET
-AC_GNU_SOURCE
+AC_USE_SYSTEM_EXTENSIONS
 AC_PROG_LIBTOOL
 AC_PATH_PROG([LDCONFIG], [ldconfig],
 	[AC_MSG_ERROR([ldconfig not found])],