--- makerules.090203	Tue Feb  3 22:49:48 2009
+++ makerules	Sat Apr  9 17:54:26 2022
@@ -154,15 +154,7 @@
 PERL = jperl
 MKBTF = $(BD)/etc/mkbtf
 BACKUP = $(BD)/etc/backup_copy
-ifneq ($(findstring $(CROSS_ARCH), sun4m sun4u i86pc), )
-  CPP = /usr/$(CCS)lib/cpp
-else
-  ifeq ($(CROSS_ARCH), OpenBSD)
-    CPP = /usr/libexec/cpp
-  else
-    CPP = /lib/cpp
-  endif
-endif
+CPP = $(GNU_BD)/bin/i386-unknown-elf-cpp
 
 ### ヘッダファイルのディレクトリ ###
 HEADER = $(BD)/include