[Haskell-beginners] Cannot rebuild GHC 6.12.1 due to Cabal type conflict

[James Britt]

Hey all.

I wanted to rebuild GHC 6.12.1 from source (a downloaded tarball).

After the initial install I went and updated Cabal (from a tarball 
grabbed from Hackage).

When I now try to do a rebuild of GHC, I get this error


compiler/main/Packages.lhs:233:63:
     Couldn't match expected type `InstalledPackageInfo_ String'
            against inferred type 
`Cabal-1.8.0.2:Distribution.InstalledPackageInfo.InstalledPackageInfo_
                                     m'
       Expected type: [InstalledPackageInfo_ String]
       Inferred type: 
[Cabal-1.8.0.2:Distribution.InstalledPackageInfo.InstalledPackageInfo_
                         m]
     In the second argument of `map', namely `conf'
     In the first argument of `return', namely
         `(map installedPackageInfoToPackageConfig conf)'
make[1]: *** [compiler/stage1/build/Packages.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [all] Error 2



(also here: http://hpaste.org/fastcgi/hpaste.fcgi/view?id=16380#a16380)


I'm running the build like this:


make distclean
sh boot
./configure --enable-shared
make -j 2


but (I'm guessing) it's looking at the already-installed Cabal libs and 
not liking what it's getting.

Any ideas on how to get past this?

Thanks,

James Britt

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