1 files changed, 5 insertions, 0 deletions

diff --git a/src/akcom-udpecho.c b/src/akcom-udpecho.c
index 03a580d..582efbd 100644
--- a/src/akcom-udpecho.c
+++ b/src/akcom-udpecho.c
@@ -56,6 +56,11 @@
 ///////////////
 #pragma mark - Headers
 
+// defined in the Single UNIX Specification
+#ifndef _XOPEN_SOURCE
+#   define _XOPEN_SOURCE 600
+#endif
+
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif