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-rw-r--r--src/lib/md5.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/lib/md5.c b/src/lib/md5.c
index 6f2b2e36..959865fe 100644
--- a/src/lib/md5.c
+++ b/src/lib/md5.c
@@ -40,6 +40,10 @@
* or FITNESS FOR A PARTICULAR PURPOSE. Use this program at your own risk!
*/
+#if defined(__linux__) || defined(__CYGWIN__)
+#define _DEFAULT_SOURCE
+#endif
+
#include <ouroboros/endian.h>
#include <ouroboros/md5.h>