--- cs/rules.mk.in.orig	2013-12-31 22:42:58.734123396 +0900
+++ cs/rules.mk.in	2013-12-31 22:43:10.268123883 +0900
@@ -158,7 +158,7 @@
 	@touch Makefile.depends
 	@if test "x" != "x$(SOURCE_FILES)"; then \
 	  for II in "$(SOURCE_FILES)"; do \
-		gcc -M -MG ${CFLAGS} $$II >> Makefile.depends; \
+		${CC} -M -MG ${CFLAGS} $$II >> Makefile.depends; \
 	  done; \
 	 fi
 	@echo "** (done) "