1 files changed, 2 insertions, 0 deletions

diff --git a/testing/av_test.c b/testing/av_test.c
index 7418a15a..aeb661be 100644
--- a/testing/av_test.c
+++ b/testing/av_test.c
@@ -22,6 +22,8 @@
  *   -lopencv_highgui -lopencv_imgproc -lsndfile -pthread -lvpx -lopus -lsodium -lportaudio
  */
 
+#define _XOPEN_SOURCE 600
+
 #ifdef __cplusplus
 extern "C" {
 #endif