This build of TXR is linked against the Cygnal library, which is a patched
derivative of the Cygwin library. It is also linked against a redistibutable
GCC runtime.

Cygwin is Copyright (C) 1995-2016 Red Hat Inc. and the Cygnal version
is distributed and used with TXR in accordance with the Lesser GNU Public
License (LGPL), Version 3 <https://cygwin.com/COPYING.LIB>.

The Cygnal project is hosted at <http://www.kylheku.com/cygnal>.

The redistributable GCC runtime is also under the Lesser GNU Public License,
and is Copryight (C) 2016 The Free Software Foundation, Inc.