MIT-style License

Copyright (c) 1988-1989 Hans-J. Boehm, Alan J. Demers
Copyright (c) 1991-1996 by Xerox Corporation.  All rights reserved.
Copyright (c) 1996-1999 by Silicon Graphics.  All rights reserved.
Copyright (c) 1998 by Fergus Henderson.  All rights reserved.
Copyright (c) 1999-2001 by Red Hat, Inc.  All rights reserved.
Copyright (c) 1999-2011 Hewlett-Packard Development Company, L.P.
Copyright (c) 2004-2005 Andrei Polushin
Copyright (c) 2007 Free Software Foundation, Inc.
Copyright (c) 2008-2022 Ivan Maidanski
Copyright (c) 2011 Ludovic Courtes
Copyright (c) 2018 Petter A. Urkedal


THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.

Permission is hereby granted to use or copy this program
for any purpose, provided the above notices are retained on all copies.
Permission to modify the code and to distribute modified code is granted,
provided the above notices are retained, and a notice that the code was
modified is included with the above copyright notice.


Several files (gc/gc_allocator.h, extra/msvc_dbg.c) come with slightly
different licenses, though they are all similar in spirit (the exact
licensing terms are given at the beginning of the corresponding source file).

A few of the files needed to use the GNU-style build procedure come with
a modified GPL license that appears not to significantly restrict use of
the collector, though use of those files for a purpose other than building
the collector may require the resulting code to be covered by the GPL.