--- src/libafs/MakefileProto.FBSD.in.orig	2014-05-14 23:09:14.000000000 +0900
+++ src/libafs/MakefileProto.FBSD.in	2014-05-22 08:00:36.000000000 +0900
@@ -41,10 +41,12 @@
 <all>
 
 KDEFS=-Wall -nostdinc -I/usr/include -D_KERNEL -DKLD_MODULE \
-	-elf \
 	-mno-mmx -mno-3dnow -mno-sse -mno-sse2 \
-	-mno-align-long-strings -fno-common -ffreestanding \
+	-fno-common -ffreestanding \
 	-I${KBLD} -include opt_global.h -fno-strict-aliasing
+.if ${COMPILER_TYPE} != clang
+KDEFS+=	-elf -mno-align-long-strings
+.endif
 
 DBUG = -O2
 #DBUG = -O -g