Diff of /src/mk/Darwin [039283] .. [db132a]

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--- a/src/mk/Darwin
+++ b/src/mk/Darwin
@@ -2,6 +2,7 @@
 include $(depth)/mk/localdefs
 
 ALL_CXXFLAGS = $(CXXFLAGS) $(COMMONCXXFLAGS) $(LOCALCXXFLAGS) \
+           -DPUTENV_ARG_NOT_CONST \
 	   -DHAVE_VASPRINTF=1 \
 	   -DHAVE_MKDTEMP=1