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-rw-r--r--src/lib/irm.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/lib/irm.c b/src/lib/irm.c
index 6a9f837e..bd34669f 100644
--- a/src/lib/irm.c
+++ b/src/lib/irm.c
@@ -20,7 +20,11 @@
* 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/errno.h>
#include <ouroboros/hash.h>