GCC 3.1's cpp no longer searches for includes using hints from #line.

gnu/usr.bin/bc/Makefile

@@ -1,14 +1,13 @@
 # $FreeBSD$
 
-.PATH:	${.CURDIR}/../../../contrib/bc/bc \
-	${.CURDIR}/../../../contrib/bc/lib \
-	${.CURDIR}/../../../contrib/bc/doc \
-	${.CURDIR}/../../../contrib/bc/Examples
+BCDIR=	${.CURDIR}/../../../contrib/bc
+.PATH: ${BCDIR}/bc ${BCDIR}/lib ${BCDIR}/doc ${BCDIR}/Examples
 
 PROG=	bc
 SRCS=	bc.y execute.c global.c load.c main.c scan.l storage.c util.c \
 	number.c getopt.c getopt1.c
-CFLAGS+=-I. -I${.CURDIR} -I${.CURDIR}/../../../contrib/bc/h -DHAVE_CONFIG_H
+CFLAGS+=-I. -I${.CURDIR} -I${BCDIR}/h -I${BCDIR}/bc
+CFLAGS+=-DHAVE_CONFIG_H
 DPADD=	${LIBREADLINE} ${LIBTERMCAP}
 LDADD=	-lreadline -ltermcap