$NetBSD$
NetBSD support
--- libs/extc/process_stubs.c.orig 2019-10-25 23:09:16.000000000 +0000
+++ libs/extc/process_stubs.c
@@ -37,7 +37,8 @@
# include <errno.h>
# include <string.h>
# ifndef __APPLE__
-# if defined(__FreeBSD__) || defined(__DragonFly__)
+# if defined(__FreeBSD__) || defined(__DragonFly__) \
+ || defined(__NetBSD__)
# include <sys/wait.h>
# else
# include <wait.h>