Log message:
Changes 5.2.1:
* 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
  FreeBSD.

Log message:
Shuffle flags around to make sure that the system liblzma is not picked
up first.

Log message:
Changes 5.2.0:
* liblzma:
        - Added support for multi-threaded compression. See the
          lzma_mt structure, lzma_stream_encoder_mt(), and
          lzma_stream_encoder_mt_memusage() in <lzma/container.h>,
          lzma_get_progress() in <lzma/base.h>, and lzma_cputhreads()
          in <lzma/hardware.h> for details.
        - Made the uses of lzma_allocator const correct.
        - Added lzma_block_uncomp_encode() to create uncompressed
          .xz Blocks using LZMA2 uncompressed chunks.
        - Added support for LZMA_IGNORE_CHECK.
        - A few speed optimizations were made.
        - Added support for symbol versioning. It is enabled by default
          on GNU/Linux, other GNU-based systems, and FreeBSD.
        - liblzma (not the whole XZ Utils) should now be buildable
          with MSVC 2013 update 2 or later using windows/config.h.
* xz:
        - Fixed a race condition in the signal handling. It was
          possible that e.g. the first SIGINT didn't make xz exit
          if reading or writing blocked and one had bad luck. The fix
          is non-trivial, so as of writing it is unknown if it will be
          backported to the v5.0 branch.
        - Multi-threaded decompression can be enabled with the
          --threads (-T) option.
        - New command line options in xz: --single-stream,
          --block-size=SIZE, --block-list=SIZES,
          --flush-timeout=TIMEOUT, and --ignore-check.
        - xz -lvv now shows the minimum xz version that is required to
          decompress the file. Currently it is 5.0.0 for all supported
          .xz files except files with empty LZMA2 streams require 5.0.2.
* xzdiff and xzgrep now support .lzo files if lzop is installed.
  The .tzo suffix is also recognized as a shorthand for .tar.lzo.

Log message:
Add an nls option to xz that can be disabled, but is on by default. If off,
gettext is not required.

Log message:
Changes 5.0.7:
* Fix regressions introduced in 5.0.6:
  - Fix building with non-GNU make.
  - Fix invalid Libs.private value in liblzma.pc which broke
    static linking against liblzma if the linker flags were
    taken from pkg-config.

Log message:
No need to set BUILDLINK_PREFIX.xz here.
Default value set in mk/bsd.buildlink3.mk should be sufficient.
Moreover, this guess will not works well on Haiku. Its header files are in
"headers", not "include".

Log message:
GCC_REQD should be appended to, not set.

Fixes issues where a newer GCC has been chosen by the user but the GCC_REQD
was forcing an older (and broken) one to be pulled regardless.

Log message:
Use find-headers instead of find-files to detect builtin header files.

Log message:
Rename filename of PLIST for Cygwin, PLIST.cygwin to PLIST.Cygwin.
Thank you, joerg@ and obache@.

Log message:
Fix packaging on Cygwin.

* On Microsoft Windows platform, liblzma.def is created to import librares
  for non-GNU toochains.