--- sim/Makefile.in.orig	2017-01-21 22:46:47.000000000 +0900
+++ sim/Makefile.in	2021-12-29 00:04:45.072640000 +0900
@@ -90,8 +90,8 @@
 	"AR_FLAGS=$(AR_FLAGS)" \
 	"CC=$(CC)" \
 	"CC_FOR_BUILD=$(CC_FOR_BUILD)" \
-	"CFLAGS=$(CFLAGS)" \
-	"CFLAGS_FOR_BUILD=$(CFLAGS_FOR_BUILD)" \
+	"CFLAGS=$(CFLAGS) -fcommon" \
+	"CFLAGS_FOR_BUILD=$(CFLAGS_FOR_BUILD) -fcommon" \
 	"RANLIB=$(RANLIB)" \
 	"MAKEINFO=$(MAKEINFO)" \
 	"INSTALL=$(INSTALL)" \