NetBSD cvsweb for reviewing changes:
  http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libexecinfo/

Update steps:

1) Checkout the head of the vendor branch:

	REPO=svn+ssh://svn.freebsd.org/
	svn co $REPO/base/vendor/NetBSD/libexecinfo/dist

2) Update files:

	rm dist/*
	export CVSROOT=anoncvs@anoncvs.NetBSD.org:/cvsroot
	cvs export -r HEAD -d dist src/lib/libexecinfo/backtrace.3
	cvs export -r HEAD -d dist src/lib/libexecinfo/backtrace.c
	cvs export -r HEAD -d dist src/lib/libexecinfo/builtin.c
	cvs export -r HEAD -d dist src/lib/libexecinfo/execinfo.h
	cvs export -r HEAD -d dist src/lib/libexecinfo/symtab.c
	cvs export -r HEAD -d dist src/lib/libexecinfo/symtab.h
	cvs export -r HEAD -d dist src/lib/libexecinfo/unwind.c
	cvs export -r HEAD -d dist src/lib/libexecinfo/unwind.h
	cvs export -r HEAD -d dist src/lib/libexecinfo/unwind_arm_ehabi_stub.c

3) Commit the new versions:

	svn commit -m "Vendor import of NetBSD's libexecinfo at `date +%F`" dist
	svn cp -m "Tag `date +%F` import of NetBSD's libexecinfo" \
	    $REPO/base/vendor/NetBSD/libexecinfo/dist \
	    $REPO/base/vendor/NetBSD/libexecinfo/`date +%Y%m%d`

4) Merge to head:

	cd /path/to/head/checkout
	cd contrib/libexecinfo
	svn merge --accept=postpone $REPO/base/vendor/NetBSD/libexecinfo/dist .
	svn diff --no-diff-deleted \
	    --old=$REPO/base/vendor/NetBSD/libexecinfo/dist --new=.