It looks like NetBSD used to use GNU tar, there are three tar directories in:
http://cvsweb.netbsd.org/bsdweb.cgi/src/gnu/usr.bin/
About a year ago NetBSD switched to bsdtar/libarchive, I believe it's from FreeBSD originally, but it runs on many, many different platforms, see the bsdtar/libarchive homepage:
http://people.freebsd.org/~kientzle/libarchive/
And here is bsdtar/libarchive in the NetBSD source tree:
http://cvsweb.netbsd.org/bsdweb.cgi/...st/libarchive/
http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libarchive/
http://cvsweb.netbsd.org/bsdweb.cgi/...n/tar/Makefile
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UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things.
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