Index: liblockfile-1.06/configure.in
===================================================================
--- liblockfile-1.06.orig/configure.in
+++ liblockfile-1.06/configure.in
@@ -7,7 +7,7 @@ AC_PROG_CC
 
 dnl Set Default CFLAGS
 if test "$GCC" = "yes"; then
-    CFLAGS="$CFLAGS -Wall -D_GNU_SOURCE"
+    CFLAGS="$CFLAGS -Wall"
 fi
 
 TARGETS="static"