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-rw-r--r--src/string/mempcpy.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/string/mempcpy.c b/src/string/mempcpy.c
index c23ca69e..a297985e 100644
--- a/src/string/mempcpy.c
+++ b/src/string/mempcpy.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
 #include <string.h>
 
 void *mempcpy(void *dest, const void *src, size_t n)