diff --git a/.gitignore b/.gitignore
index 816df99..94f2c60 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,7 +5,9 @@ a.out
 autom4te.cache
 darkstat-*
 hex-ify
+hex-ify.DSYM/
 c-ify
+c-ify.DSYM/
 config.h
 config.h.in
 config.log
diff --git a/now.c b/now.c
index b1a43cb..0cd0776 100644
--- a/now.c
+++ b/now.c
@@ -30,9 +30,11 @@
 #  include <mach/mach.h>
 #  include <mach/mach_time.h>
 
+#  ifndef CLOCK_REALTIME
    typedef int clockid_t;
 #  define CLOCK_REALTIME 0
 #  define CLOCK_MONOTONIC 1
+#  endif
 
    static uint64_t mono_first = 0;