> Due to a problem with the template-haskell package and Cabal, you >> cannot cabal-install the emgm package with GHC 6.8. However, take >> heart! EMGM works very well with GHC 6.8. You merely have to download >> the tar.gz package from Hackage yourself, build it, and install it. >> > > I thought I had seen you mention a workaround for that issue, but > if not, perhaps you might want to add your experience to > > http://hackage.haskell.org/trac/hackage/ticket/326 > Cabal should support Cabal-version-dependent Setup.hs >
I thought I had worked around it, too. Unfortunately, I can only test once I upload it to Hackage. Once I had, I discovered it wasn't fixed, yet. :-/ It's a problem with cabal-install/Cabal dealing with the lack of version dependencies in template-haskell. Even though I have template-haskell >= 2.2 in my build-depends, cabal-install insists on trying to install 2.3, which of course fails when you're using GHC 6.8. Perhaps my problem cannot be fixed within the Setup.lhs? Maybe cabal-install/Cabal is resolving dependencies solely based on the .cabal file? I don't know. There's a sketched hack-around at the end, using Setup.hs only to call to > separate Setup-version.hs files, to circumvent Cabal API > instabilities. Not nice, but perhaps better than to bypass Cabal > alltogether? One would also have to pass parameters, and the > Process API has changed in the meantime.., which I why I still > think Cabal itself should simply be able to pick cabal-versioned > configuration and setup files, if they exist. > I like the hack in that ticket. Very nice. ;) Though it apparently fails for multiple versions of Cabal. I just checked my system and it produced: $ ghc-pkg field Cabal version version: 1.6.0.1 version: 1.6.0.2 Sean
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