Okay, so the problem is with cabal-install. I'd don't verily need ghc 7.2, I think I'll just stick to 7.0.4 unti cabal-install is updated, it will be simpler.
2011/10/24 Daniel Fischer <daniel.is.fisc...@googlemail.com> > On Monday 24 October 2011, 23:13:32, Yves Parès wrote: > > I'm using GHC 7.2.1 and cabal-install 0.8 (Cabal 1.8.0.2), and when > > "cabal install rsa" > > > > > Apparently it's an instance being declared twice. > > However RSA hackage page states that it compiles under GHC 7.2: > > http://hackage.haskell.org/package/RSA > > The instance in the rsa package is guarded by a Cabal MIN_VERSION macro: > > #if !MIN_VERSION_random(1,0,1) > instance Random Word8 where > randomR (a,b) g = let aI::Int = fromIntegral a > bI::Int = fromIntegral b > (x, g') = randomR (aI, bI) g > in (fromIntegral x, g') > random = randomR (minBound, maxBound) > #endif > > Unfortunately, that macro was broken in some Cabal versions, among them > 1.8.0.2, so the negated check goes wrong (#if !(MIN_...) would work). > [As a quickfix for this package, you could edit the source, but you'll > probably come across more macro problems later.] > > Build yourself a new cabal-install. > If you use 7.2.1 for that, the recipe at https://gist.github.com/1169332 > tells you what you have to change. > If you have an older ghc still available, the vanilla procedure should work > with that (if you're using the old 6.12.* with the Cabal-1.8.0.2, first > install a later Cabal version, 1.8.0.6 works). >
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