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-rw-r--r--include/features.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/features.h b/include/features.h
index 294c61dd..61ad2f5b 100644
--- a/include/features.h
+++ b/include/features.h
@@ -1,7 +1,7 @@
#ifndef _FEATURES_H
#define _FEATURES_H
-#ifdef _ALL_SOURCE
+#if defined(_ALL_SOURCE) && !defined(_GNU_SOURCE)
#define _GNU_SOURCE 1
#endif