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-1.6.0.1)

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.

Trac metadata

Trac field	Value
Version	6.9
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Build System
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