This program 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 (a copy
is included as `LICENSE.GPLv2`), or (at your option) any later
version.

As a special exception, the copyright holders of this library give you
permission to link this library with the independent modules that
constitute the <http://hackage.haskell.org/package/cabal-install>
package and its dependencies for the purpose of producing the `cabal`
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting `cabal` executable
under terms of your choice, provided that you also meet, for each
linked independent module, the terms and conditions of the license of
that module. An independent module is a module which is not derived
from or based on this library. If you modify this library, you may
extend this exception to your version of the library, but you are not
obliged to do so. If you do not wish to do so, delete this exception
statement from your version.

The aforementioned special exception applies (at your option)
retroactively to all prior releases of this library.