--- libeio/configure.ac	2011/05/02 13:11:01	1.6
+++ libeio/configure.ac	2011/05/02 13:12:22	1.7
@@ -13,8 +13,7 @@
   CFLAGS="-O3 $CFLAGS"
 fi
 
-dnl somebody will forgive me
-CFLAGS="-D_GNU_SOURCE $CFLAGS"
+AC_GNU_SOURCE
 
 m4_include([libeio.m4])