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(Imported from Trac #229, reported by guest on 2008-02-03)
Currently Cabal builds C sources by going via ghc. On some platforms this introduces some limitations (Windows especially, I think).
See this conversation for an example where it would be useful: http://email@example.com/msg37179.html
(Imported comment by @dcoutts on 2008-02-03)
See also ticket #816 on the difficulties caused.