diff -rupN libffado-2.3.0.org/src/libutil/PosixMessageQueue.h libffado-2.3.0/src/libutil/PosixMessageQueue.h
--- libffado-2.3.0.org/src/libutil/PosixMessageQueue.h	2009-12-19 11:26:20.000000000 -0500
+++ libffado-2.3.0/src/libutil/PosixMessageQueue.h	2017-11-05 16:01:06.730315493 -0500
@@ -35,6 +35,7 @@
 #include <time.h>
 #include <mqueue.h>
 #include <string>
+#include <signal.h>
 
 namespace Util
 {