Building GHC 6.10 with Cabal 1.6 fails due to in-tree Cabal 1.5.5
If you've installed Cabal 1.6 (as we're recommending) GHC won't build, falling over at,
/home/dons/ghc-6.10/build/utils/installPackage/install-inplace/bin/installPackage install '/home/dons/ghc-6.10/build/utils/ghc-pkg/install-inplace/bin/ghc-pkg' installPackage: You need to re-run the 'configure' command. The version of Cabal being used has changed (was Cabal-1.5.5, now Cabal-220.127.116.11)
Working out if this really is a correctness issue seems a good idea -- maybe we can lift this restriction, since it seems likely people will in the future have newer cabals than the one ghc ships with today.