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You should have received a copy of the GNU General Public License
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On Debian systems, the complete text of the GNU Free Documentation
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.

On Debian systems, the complete text of the GNU General Public
License version 2 can be found in `/usr/share/common-licenses/GPL-2'. 

This file 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.

You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.

As a special exception to the GNU General Public License, if you
distribute this file as part of a program that contains a
configuration script generated by Autoconf, you may include it under
the same distribution terms that you use for the rest of that program.

On Debian systems, the complete text of the GNU General Public
License version 2 can be found in `/usr/share/common-licenses/GPL-2'. 

This configure script is free software; the Free Software Foundation
gives unlimited permission to copy, distribute and modify it. 

Permission is hereby granted, free of charge, to any person obtaining a copy
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The above copyright notice and this permission notice shall be included in
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The public domain tools in this package are distributed by the FSF, which
is notorious for exactness in licensing.

From the FSF's website
(https://gnu.org/licenses/license-list.html#PublicDomain), we can see that
when they say public domain, this is what they mean:

"Being in the public domain is not a license; rather, it means the material
is not copyrighted and no license is needed. Practically speaking, though, if
a work is in the public domain, it might as well have an all-permissive
non-copyleft free software license."