oksh-noxz [fork] Portable OpenBSD ksh, based on the Public Domain Korn Shell (pdksh).
	git clone https://noxz.tech/git/oksh-noxz.git
	oksh-noxz

commit: 366df882b13f859e9825efa8ee7f6f244a23a080
parent: b9fce76f371f4520cffec9f4e1a24595ee47bb2a
author: Brian Callahan <bcallah@openbsd.org>
date:   Sun, 7 Jan 2018 19:30:51 -0500

Linux needs to include sys/types.h and grp.h

diff --git a/portable.h b/portable.h
@@ -11,7 +11,9 @@
 
 #ifdef __linux__
 #include <sys/file.h>
+#include <sys/types.h>
 
+#include <grp.h>
 #include <stdint.h>
 #include <stdlib.h>
 #endif /* __linux__ */