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--- a/src/mk/Darwin
+++ b/src/mk/Darwin
@@ -2,8 +2,6 @@
 include $(depth)/mk/localdefs
 
 ALL_CXXFLAGS = $(CXXFLAGS) $(COMMONCXXFLAGS) $(LOCALCXXFLAGS) \
-	   -DHAVE_VASPRINTF=1 \
-	   -DHAVE_MKDTEMP=1 \
 	   -DSTATFS_INCLUDE="<sys/mount.h>"
 
 RANLIB = ranlib