I have windows 7 with mingw/msys environment. I just installed the latest haskell platform and cabal-dev. For some reason, cabal-dev ghci fails with no much information. I tried to add -v and message is not helpfull at all. Here is what I did. $ cd haskell_dev $ cabal-dev install cabal.exe: No cabal file found. Please create a package description file <pkgname>.cabal $cabal init .... $ cabal-dev install $ cabal-dev ghci FAILED: Failed to extract GHC build arguments -------------------------------------------------- Run ghci configured as per the specified cabal file. Usage: cabal-dev.exe <command> ................... $ cabal-dev ghci -v c:\build\Haskell\2011.2.0.1\lib\extralibs\bin\cabal.exe --numeric-version c:\build\Haskell\2011.2.0.1\bin\ghc-pkg.exe --version Using ghc-pkg 7.0.3 c:\build\Haskell\2011.2.0.1\lib\extralibs\bin\cabal.exe --version c:\build\Haskell\2011.2.0.1\lib\extralibs\bin\cabal.exe --config-file=c:\build\Projects\eclipseworkspace\Test\cabal-dev\cabal.config build --verbose=2 --with-ghc=fake-ghc-cabal-dev FAILED: Failed to extract GHC build arguments The second question relates to installing haskell platform on windows 7 with profiling enabled. I tried cabal install haskell-platform --reinstall -p (and some other options) but it didn't work as haskell-platform is not on hackage. Is reinstalling each library one by one the only option available for windows users? Thanks, Malik