XZ Utils 5.2.1 is available at <http://tukaani.org/xz/>. Here is an 
extract from the NEWS file:

  * Fixed a compression-ratio regression in fast mode of LZMA1 and
    LZMA2. The bug is present in 5.1.4beta and 5.2.0 releases.

  * Fixed a portability problem in xz that affected at least OpenBSD.

  * Fixed xzdiff to be compatible with FreeBSD's mktemp which differs
    from most other mktemp implementations.

  * Changed CPU core count detection to use cpuset_getaffinity() on

Lasse Collin  |  IRC: Larhzu @ IRCnet & Freenode

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