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-rw-r--r--src/lib/cacep.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/lib/cacep.c b/src/lib/cacep.c
index 55d11b0f..722adca1 100644
--- a/src/lib/cacep.c
+++ b/src/lib/cacep.c
@@ -20,7 +20,8 @@
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
-#include <ouroboros/config.h>
+#define _POSIX_C_SOURCE 199309L
+
#include <ouroboros/cacep.h>
#include <ouroboros/dev.h>
#include <ouroboros/errno.h>