1 files changed, 3 insertions, 1 deletions
diff --git a/ioops.c b/ioops.c
index e2b9136..c1eeddc 100644
--- a/ioops.c
+++ b/ioops.c
@@ -1,4 +1,6 @@
-#define _GNU_SOURCE
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+#endif
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>