Cabal-get is not using Distribution.GetOps anymore.

Cabal.cabal

@@ -39,9 +39,9 @@ Exposed-Modules:
 	Distribution.Simple.SrcDist,
 	Distribution.Simple.Utils,
 	Distribution.Compat.FilePath,
-	Distribution.GetOpt,
 	Distribution.Version
 Other-Modules:
+	Distribution.GetOpt,
 	Distribution.Compat.Directory,
 	Distribution.Compat.Exception,
 	Distribution.Compat.RawSystem

Setup.lhs

 #!/usr/bin/runhaskell
-
 > module Main where
-
 > import Distribution.Simple
-
 > main :: IO ()
 > main = defaultMain