This is the Inform compiler. It has been modified slightly to work
better when the Inform standard library is in a non-standard
location and to make it compatible with the GNU FSDG.

Compiling Inform is very easy. Install GCC and GNU Autoconf and then 
run: autoreconf --install

After that it's the usual dance of:
./configure
make
make install

Run ./configure --help to see a list of available options.

Inform 6 is published under the original Inform licence (which is
proprietary), or under the Artistic License 2.0, at the user's choice.

When getting a copy of the software I selected that my copy would be
under the Artistic License 2.0.

Once I had a copy of the software under that license I invoked the
Artistic License's "relicensing" clause in Section 4(c)(ii) to
relicense under the GNU General Public License. This copy of Inform is
now licensed in that way.

Based on
https://web.archive.org/web/20160326074115/http://www.perlfoundation.org/artistic_2_0_notes
from the Perl Software Foundation, who wrote both the Artistic License
1.0 and 2.0, the GPL qualifies under 4(c)(ii).

--
This file is part of Inform.

Inform 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 3 of the License, or (at your
option) any later version.

Inform 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 Inform. If not, see https://gnu.org/licenses/