--- a/mono/io-layer/processes.c	2017-03-15 09:36:22.000000000 +0000
+++ b/mono/io-layer/processes.c	2018-06-05 19:58:57.657838748 +0000
@@ -19,6 +19,7 @@
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/sysmacros.h>
 #include <unistd.h>
 #ifdef HAVE_SIGNAL_H
 #include <signal.h>