Additional copyright / license notice for a BWA component
=========================================================

The file src/3rdparty/bwa/bwt_gen.c (BWT-Index construction), which is
statically linked into the distributed `panmap` binary, carries its own
copyright and license notice, reproduced here verbatim:

    BWTConstruct.c    BWT-Index Construction

    Copyright (C) 2004, Wong Chi Kwong.

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; either version 2
    of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

The remainder of the vendored BWA sources (BWA-backtrack / BWA-SW) are
distributed under the GNU General Public License, version 3 (with no
"or later" grant) — see the accompanying `bwa-COPYING` file; some BWA-MEM
files carry an MIT header. bwt_gen.c's "version 2 ... or any later version"
grant resolves up to v3 when combined with the GPLv3 sources, but the
GPLv3-only components cap the combined work: the effective license of the
statically-linked `panmap` binary is therefore GPL-3.0-only.
