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: 9f7888fe384dd87232baa1039c5d85125aa55ec5
parent: 6924710815dcc99f5fa59c647ec81a2c35a42c2a
author: Maya Rashish <maya@NetBSD.org>
date:   Wed, 24 Jul 2019 14:16:31 +0300

Protect timespec* macros with ifndef rather than !OpenBSD.

NetBSD provides timespecsub as well, and will warn about redefinition.

diff --git a/portable.h b/portable.h
@@ -145,12 +145,14 @@
 #endif
 
 /* From OpenBSD sys/time.h */
-#ifndef __OpenBSD__
+#ifndef timespeccmp
 #define timespeccmp(tsp, usp, cmp)                                      \
         (((tsp)->tv_sec == (usp)->tv_sec) ?                             \
             ((tsp)->tv_nsec cmp (usp)->tv_nsec) :                       \
             ((tsp)->tv_sec cmp (usp)->tv_sec))
+#endif
 
+#ifndef timespecsub
 #define timespecsub(tsp, usp, vsp)                                      \
         do {                                                            \
                 (vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec;          \
@@ -160,7 +162,7 @@
                         (vsp)->tv_nsec += 1000000000L;                  \
                 }                                                       \
         } while (0)
-#endif /* !__OpenBSD__ */
+#endif
 
 #if !defined(HAVE_ST_MTIM) && !defined(HAVE_ST_MTIMESPEC)
 #define timespeccmp(tsp, usp, cmp) (tsp) cmp (usp)