--- ./Makefile.orig	1996-10-22 04:29:46.000000000 +0000
+++ ./Makefile	2014-02-17 13:43:18.000000000 +0000
@@ -1,9 +1,9 @@
 #	@(#)Makefile	4.1.1	1996/10/21
 #
-DIFF=	/bin/diff
-DIFFH=	/usr/libexec/diffh
-PR=	/bin/pr
-CFLAGS=	-O -DDIFF='"${DIFF}"' -DDIFFH='"${DIFFH}"' -DPR='"${PR}"'
+DIFF=	${PREFIX}/bin/2diff
+DIFFH=	${PREFIX}/libexec/2diffh
+PR=	/usr/bin/pr
+CFLAGS+=-DDIFF='"${DIFF}"' -DDIFFH='"${DIFFH}"' -DPR='"${PR}"'
 SEPFLAG=-i
 DESTDIR=
 
@@ -14,14 +14,15 @@
 all: diff diffh
 
 diff: ${OBJS}
-	cc ${CFLAGS} -o diff ${OBJS} ${SEPFLAG} ${LDFLAGS}
+	${CC} ${CFLAGS} -o diff ${OBJS} ${SEPFLAG} ${LDFLAGS}
 
 diffh: diffh.o
-	cc -o diffh diffh.o ${SEPFLAG} ${LDFLAGS}
+	${CC} ${CFLAGS} -o diffh diffh.o ${SEPFLAG} ${LDFLAGS}
 
 clean:
 	rm -f diff diffh ${OBJS} diffh.o
 
 install: all
-	install -s diff ${DESTDIR}/bin/diff
-	install -s diffh ${DESTDIR}/usr/libexec/diffh
+	${BSD_INSTALL_PROGRAM} diff  ${DESTDIR}${DIFF}
+	${BSD_INSTALL_PROGRAM} diffh ${DESTDIR}${DIFFH}
+	${BSD_INSTALL_MAN}     ../../man/man1/diff.1 ${DESTDIR}${MANPREFIX}/man/man1/2diff.1