bootstrap-pkgsrc-20030701.tar.gz contains mtree source from NetBSD.

ftp://ftp.netbsd.org/pub/NetBSD/packages/bootstrap-pkgsrc.tar.gz
http://ring.maffin.ad.jp/archives/NetBSD/packages/bootstrap-pkgsrc/ \
        bootstrap-pkgsrc-20030701.tar.gz

This will build on Linux and provide tripwire like functionality with
a different style. Makes custom database(s) of filesystem trees and
objects, with md5/sha hashing.

cd bootstrap-pkgsrc/
cd digest/
chmod +x configure
./configure
make
cd ../mtree
chmod +x configure
./configure
make

gzip -c mtree.8 > /usr/man/man8/mtree.8.gz
install -s --owner=0 --group=0 -m 0755 mtree /usr/sbin/mtree