diff --git a/lib/ack/libfp/Makefile b/lib/ack/libfp/Makefile
index 3808f4eea..e13b158c0 100644
--- a/lib/ack/libfp/Makefile
+++ b/lib/ack/libfp/Makefile
@@ -6,9 +6,9 @@
 .fc.o:
 	${_MKTARGET_COMPILE}
 	cp ${.IMPSRC} tmp.c
-	cc -I${.CURDIR} ${CFLAGS} -S tmp.c
+	${CC} -I${.CURDIR} ${CFLAGS} -S tmp.c
 	sed -f ${.CURDIR}/FP.script tmp.s > ${.PREFIX}.s
-	cc -I${.CURDIR} -c -o ${.TARGET} ${.PREFIX}.s
+	${CC} -I${.CURDIR} -c -o ${.TARGET} ${.PREFIX}.s
 	rm  -f tmp.c tmp.s ${PREFIX}.s
 
 LIB=	fp