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-rw-r--r--src/common.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/common.h b/src/common.h
index 458f73f..0ead60b 100644
--- a/src/common.h
+++ b/src/common.h
@@ -1,3 +1,4 @@
+#define _XOPEN_SOURCE
#include <string.h>
#include "config.h"
#include "math.h"