Hi Magnus The 'Why not LGPL' doesn't cover the particular argument here:
using the ordinary GPL for a library makes it available only for free programs.
The particular concern we have here is quite specific, considering (-->) to be a dependency, can Hackage libraries under BSD3 that depend on libraries under GPL? [1] App --> libBSD3 --> libGPL Any App built has to incorporate the GPL library - so the App has to be GPL. -- No dispute --. Similar BSD3 is a GPL compatible library, so this dependency chain would be legal: [2] App --> libGPL --> libBSD The argument is whether it is legal to distribute (read host on Hackage) BSD3 libs that depend on GPL libs - formulation [1]. -- I'd have thought Harmony would be problematic for different reasons - i.e. coping the API of a copyright work. Best wishes Stephen