Temporary readd GNU diff

etcupdate requires --change-group-format it is not easy to implement
in bsd diff so for now readd GNU diff

gnu/usr.bin/Makefile

@@ -17,7 +17,7 @@ SUBDIR_DEPEND_gdb=	binutils
 .endif
 
 SUBDIR.${MK_GCC}+=	cc
-SUBDIR.${MK_GNU_DIFF}+=	diff3
+SUBDIR.${MK_GNU_DIFF}+=	diff diff3
 SUBDIR.${MK_GNU_GREP}+=	grep
 SUBDIR.${MK_GPL_DTC}+=	dtc
 SUBDIR.${MK_TESTS}+=	tests

gnu/usr.bin/diff/Makefile

@@ -0,0 +1,36 @@
+# $FreeBSD$
+
+.include <src.opts.mk>
+
+DIFFSRC=${.CURDIR}/../../../contrib/diff/src
+.PATH: ${DIFFSRC} \
+       ${.CURDIR}/../../../contrib/diff/lib \
+       ${.CURDIR}/../../../contrib/diff/man \
+       ${.CURDIR}/../../../contrib/diff/doc
+
+PROG=	diff
+SRCS=   analyze.c context.c diff.c dir.c ed.c ifdef.c io.c \
+	normal.c side.c util.c \
+	xmalloc.c strtoumax.c cmpbuf.c exitfail.c error.c quotesys.c \
+	strftime.c c-stack.c basename.c exclude.c hard-locale.c \
+	file-type.c posixver.c prepargs.c version-etc.c
+
+# Important for ctype macros!
+CFLAGS+=-funsigned-char
+
+CFLAGS+=-DHAVE_CONFIG_H
+CFLAGS+=-DPR_PROGRAM=\"/usr/bin/pr\"
+CFLAGS+=-I${.CURDIR}/../../../contrib/diff
+CFLAGS+=-I${.CURDIR}/../../../contrib/diff/src
+CFLAGS+=-I${.CURDIR}/../../../contrib/diff/lib
+CFLAGS+=-I${DESTDIR}/usr/include/gnu
+
+MAN=	diff.1 diff.7
+
+LIBADD+=	gnuregex
+
+.if ${MK_TESTS} != "no"
+SUBDIR+=	tests
+.endif
+
+.include <bsd.prog.mk>

gnu/usr.bin/diff/Makefile.depend

@@ -0,0 +1,19 @@
+# $FreeBSD$
+# Autogenerated - do NOT edit!
+
+DIRDEPS = \
+	gnu/lib/csu \
+	gnu/lib/libgcc \
+	gnu/lib/libregex \
+	include \
+	include/xlocale \
+	lib/${CSU_DIR} \
+	lib/libc \
+	lib/libcompiler_rt \
+
+
+.include <dirdeps.mk>
+
+.if ${DEP_RELDIR} == ${_DEP_RELDIR}
+# local dependencies - needed for -jN in clean tree
+.endif

gnu/usr.bin/diff/tests/Makefile

@@ -0,0 +1,15 @@
+# $FreeBSD$
+
+PACKAGE=	tests
+
+TESTSRC=	${SRCTOP}/contrib/netbsd-tests/usr.bin/diff
+
+NETBSD_ATF_TESTS_SH=	diff_test
+ATF_TESTS_SH_SED_diff_test=	-e 's/t_diff/`basename $$0`/g'
+
+${PACKAGE}FILES+=	d_mallocv1.in
+${PACKAGE}FILES+=	d_mallocv2.in
+
+.include <netbsd-tests.test.mk>
+
+.include <bsd.test.mk>

gnu/usr.bin/diff/tests/Makefile.depend

@@ -0,0 +1,11 @@
+# $FreeBSD$
+# Autogenerated - do NOT edit!
+
+DIRDEPS = \
+
+
+.include <dirdeps.mk>
+
+.if ${DEP_RELDIR} == ${_DEP_RELDIR}
+# local dependencies - needed for -jN in clean tree
+.endif