1 files changed, 6 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 06e5d24312..1bbf5f9506 100644
--- a/Makefile
+++ b/Makefile
@@ -343,6 +343,8 @@ all::
 # return NULL when it receives a bogus time_t.
 #
 # Define HAVE_CLOCK_GETTIME if your platform has clock_gettime in librt.
+#
+# Define HAVE_CLOCK_MONOTONIC if your platform has CLOCK_MONOTONIC in librt.
 
 GIT-VERSION-FILE: FORCE
 	@$(SHELL_PATH) ./GIT-VERSION-GEN
@@ -1402,6 +1404,10 @@ ifdef HAVE_CLOCK_GETTIME
 	EXTLIBS += -lrt
 endif
 
+ifdef HAVE_CLOCK_MONOTONIC
+	BASIC_CFLAGS += -DHAVE_CLOCK_MONOTONIC
+endif
+
 ifeq ($(TCLTK_PATH),)
 NO_TCLTK = NoThanks
 endif