--- Gnu-Mach/ipc/ipc_mqueue.h	2020/09/02 04:45:06	1.1.1.3
+++ Gnu-Mach/ipc/ipc_mqueue.h	2020/09/02 04:47:18	1.1.1.4
@@ -38,6 +38,7 @@
 #include <kern/assert.h>
 #include <kern/lock.h>
 #include <kern/macro_help.h>
+#include <ipc/ipc_kmsg_queue.h>
 #include <ipc/ipc_kmsg.h>
 #include <ipc/ipc_thread.h>