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-rw-r--r--src/lib/dev.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/src/lib/dev.c b/src/lib/dev.c
index dd908f78..1d1e9476 100644
--- a/src/lib/dev.c
+++ b/src/lib/dev.c
@@ -20,9 +20,14 @@
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
+#if defined(__linux__) || defined(__CYGWIN__)
+#define _DEFAULT_SOURCE
+#else
+#define _POSIX_C_SOURCE 200809L
+#endif
+
#include <ouroboros/endian.h>
-#define _POSIX_C_SOURCE 200809L
#include "config.h"
#include <ouroboros/hash.h>