Index: timing_mach.h
--- timing_mach.h.orig
+++ timing_mach.h
@@ -105,6 +105,9 @@ int clock_nanosleep_abstime(const struct timespec *req
 
 /* __MACH__ */
 /* ******** */
+#elif defined(__OpenBSD__)
+/* has some posix timers but not clock_nanosleep */
+int clock_nanosleep_abstime(const struct timespec *req);
 #else
 /* ***** */
 /* POSIX */
