--- a/src/components/perf_event/tests/perf_event_system_wide.c	2019-10-12 17:48:40.217216625 +0200
+++ b/src/components/perf_event/tests/perf_event_system_wide.c	2019-10-12 17:49:48.246645644 +0200
@@ -15,6 +15,9 @@
 #define __USE_GNU
 #endif
 
+/* For cpu_set_t */
+#define _GNU_SOURCE
+
 /* For sched_setaffinity() */
 #include <sched.h>
 
