Add AC_GNU_SOURCE to the fallback case.

diff --git a/configure.in b/configure.in
index 7eaefb92522194596bc07095f4aa54e3ee1191df..bd9ad7fcd97bc706567e97296a57f4f6570a21bd 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -19,6 +19,7 @@ ifdef([AC_USE_SYSTEM_EXTENSIONS], [
 AC_USE_SYSTEM_EXTENSIONS
 ], [
 AC_AIX
+AC_GNU_SOURCE
 AC_MINIX
 ])