Dear GHC team, I have tested ghc-7.4.0.20111219 on Debian Linux by 1) making it from source, 2) making it by itself, 3) making DoCon-2.12 and running its test. It looks all right. In installing DoCon, there appears a new point of installing the package Random, because Random has separated from GHC. So, I write in the DoCon-2.12 announce: ********************************************************** Used extra libraries (beyond Haskell-2010) -------------------- Set.Set, Map.Map -- of GHC, System.Random version 1.0.1.1 -- a separate from GHC library (written in Haskell) residing on http://hackage.haskell.org/package/random (first, install GHC, then use ghc to install Random). ********************************************************** Thanks to people who helped me with installing Random. I have downloaded System.Random-1.0.1.1 from http://hackage.haskell.org/package/random, unzipped it to a separate from ghc place -- call it $R, and installed it to a $R/inst by ghc --make Setup ./Setup configure --prefix=$R/inst -p ./Setup build -v ./Setup haddock ./Setup install -v After this, ghc-pkg list shows random-1.0.1.1 in the list, and now DoCon finds it. Regards, ------ Sergei mechvel@botik.ru