[Haskell-cafe] I want to upgrade to ghc 6.8.3

Hello, I am building 6.8.3 from my "local" 6.8.2. However, I am getting errors in compiling one of the Main.hs. E.g. Main.hs:76:23: Ambiguous occurrence `flags' It could refer to either `Main.flags', defined at Main.hs:118:0 or `System.Posix.flags', imported from System.Posix at Main.hs:59:0-18 ...... I did a "find . -name Main.hs" and there are several Main.hs. I am not sure which one is causing trouble or why. ?? Kind regards, Vasili