Libarchive is a programming library that can create and read several
different streaming archive formats, including most popular tar variants
and several cpio formats. It can also write shar archives and read
ISO9660 CDROM images.

bdtar is a almost fully GNU tar compatible frontend for libarchive. It
is one of the fastest tar implementations and supports many advances
features not found elsewhere.

The pkgsrc version is linked to not dpeend on other parts of pkgsrc.