Dear GHC team, ghc-7.4.0.20111219 puts the following problem of build-depends. docon.cabal of the DoCon project has build-depends: haskell2010, containers And ghc-7.4.0.20111219 reports DExport.hs:28:8: Could not find module `Random' It is a member of the hidden package `haskell98-2.0.0.1'. Perhaps you need to add `haskell98' to the build-depends in your .cabal file. Then, build-depends: haskell2010, haskell98, containers causes "Parse of field 'build-depends' failed". Then, build-depends: haskell98, containers causes VecMatr.hs:49:8: Could not find module `Data.List' It is a member of the hidden package `base'. Perhaps you need to add `base' to the build-depends in your .cabal file. It is a member of the hidden package `haskell2010-1.1.0.1'. Perhaps you need to add `haskell2010' to the build-depends in your .cabal file. Adding haskell2010 will cause "Parse of field 'build-depends' failed." Adding base will cause DExport.hs:26:8: Ambiguous module name `Prelude': it was found in multiple packages: base haskell98-2.0.0.1 Please, what is a reasonable way out ? Regards, ------ Sergei mechvel@botik.ru