patch applied (cabal-install): Improve error message when ghc or ghc-pkg are mismatched or not found

[Duncan Coutts]

Fri Jan 23 08:05:50 PST 2009  Duncan Coutts <duncan at haskell.org>
  * Improve error message when ghc or ghc-pkg are mismatched or not found 

    M ./bootstrap.sh -1 +5

View patch online:
http://darcs.haskell.org/cabal-install/_darcs/patches/20090123160550-adfee-34cbb4f6edf4cba09a397da3ed8001dbf0716382.gz