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The file src/tests/doctest.h is available under the MIT License

The MIT License (MIT)

Copyright (c) 2016-2023 Viktor Kirilov

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The files src/bin/tpl/whereami/whereami.cpp and src/bin/tpl/whereami/whereami.h
are available under the MIT License or the WTF License

Copyright Gregory Pakosz

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--------------------------------------------------------------------------------
        DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. You just DO WHAT THE FUCK YOU WANT TO.
  1. Bla bla bla
  2. Montesqieu et camembert, vive la France, zut alors!

--------------------------------------------------------------------------------

WTFPLv2 is very permissive, see http://www.wtfpl.net/faq/

However, if this WTFPLV2 is REALLY a blocker and is the reason you can't use
this project, contact me and I'll dual license it.