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-rw-r--r--src/tools/oping/oping.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/tools/oping/oping.c b/src/tools/oping/oping.c
index be87343e..13132815 100644
--- a/src/tools/oping/oping.c
+++ b/src/tools/oping/oping.c
@@ -21,6 +21,7 @@
*/
#define _POSIX_C_SOURCE 199506L
+#define __XSI_VISIBLE 500
#include <ouroboros/fqueue.h>
#include <ouroboros/dev.h>