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- add a diff.h header file, corresponding to public functions in diff.c
  and some #defines
- include this header in rcs.c
- link rcs against diff.c

this allows us to use the existing diff work from opencvs within functions
in the rcs.c API and thus in rcs programs. paves the way for diff support
in usr.bin/rcs programs.

ok joris@

#	$OpenBSD: Makefile,v 1.8 2005/10/05 23:11:15 niallo Exp $

.PATH:	${.CURDIR}/../cvs

PROG=	rcs
MAN=	rcs.1

SRCS=	ci.c co.c rcsprog.c buf.c diff.c log.c rcs.c rcsnum.c strtab.c
CFLAGS+=-I${.CURDIR}/../cvs

# Don't build the links until we actually support those commands
#LINKS=	${BINDIR}/ci ${BINDIR}/co ${BINDIR}/rcsclean ${BINDIR}/rcsdiff

CFLAGS+= -Wall
CFLAGS+= -Wstrict-prototypes -Wmissing-prototypes
CFLAGS+= -Wmissing-declarations
CFLAGS+= -Wshadow -Wpointer-arith -Wcast-qual
CFLAGS+= -Wsign-compare
CFLAGS+= -DRCSPROG

.include <bsd.prog.mk>