How do people modify the LICENSE file to indicate their GPL2/GPL2plus intention? From what I can see, the LICENSE file is the GPL2, and you need to say how it applies to your code - that's not something for the LICENSE file itself, but for the package metadata. Does Debian have some standard wording that applies this?
Section 13 of the GPL-2 (and LGPL-2) says: If the Library specifies a version number of this License which applies to it and "any later version", you have the option of following the terms and conditions either of that version or of any later version published by the Free Software Foundation. If the Library does not specify a license version number, you may choose any version ever published by the Free Software Foundation. Section 3 of the LGPL-2 permits you to convert LGPL-2 to GPL-2 or later. It uses the phrase "you must alter all the notices that refer to this License", indicating that there should be a separate specification of what license applies to what code, apart from the license text itself.
I also want to know whether all the other Haskell GPL stuff is GPL2 or GPL2+ - since I might as well follow the crowd. I'll ask Malcolm :-)
If the Cabal file simply says GPL or LGPL, I believe that in the absence of any more specific information, you can choose any version you wish. (Really, Cabal ought to allow the more specific notation, for those people who care to exclude older or newer licenses.) Regards, Malcolm