--- src/common/pipe.h	2017-08-03 21:42:22.098586810 +0200
+++ src/common/pipe.h	2017-12-16 20:27:26.546173345 +0100
@@ -18,6 +18,7 @@
 #ifndef LTTNG_PIPE_H
 #define LTTNG_PIPE_H
 
+#include <sys/types.h>
 #include <pthread.h>
 #include <common/macros.h>