clock.h: newer OS.X has monotonic clock, fixes #4028

diff --git a/src/clock.h b/src/clock.h
index 2dfceef009fde40bc2bc82b9509513fd241beb69..2be967c333b8772649ecf38aeec802e805c6a805 100644 (file)
--- a/src/clock.h
+++ b/src/clock.h
@@ -25,7 +25,7 @@
 #define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC
 #endif
 
-#ifdef PLATFORM_DARWIN
+#if defined(PLATFORM_DARWIN) && !defined(CLOCK_MONOTONIC)
 #error "Platforms without monotonic clocks are not supported!"
 #define CLOCK_MONOTONIC 0
 #define CLOCK_REALTIME 0