anchor.diff:   # from darinmorrison/haskell, related to ncurses, not sure if it is needed
    libtinfo5 \
    # mentioned on the GHC wiki
  - autoconf automake libtool make libgmp-dev ncurses-dev g++ llvm python bzip2 ca-certificates \
  + autoconf automake libtool make libgmp-dev ncurses-dev g++ llvm-3.4-dev python bzip2 ca-certificates \
    ## install minimal set of haskell packages
    # from darinmorrison/haskell
  - ghc-7.8.3 \
  + ghc-7.8.4 \
    alex \
  - cabal-install-1.20 \
  + cabal-install-1.22 \
    happy \
    # development conveniences
    sudo xutils-dev \
  
positive.code: # mount the GHC source code into /home/ghc
  #
  #    sudo docker run --rm -i -t -v `pwd`:/home/ghc gregweber/ghc-haskell-dev /bin/bash
  #
  # There is one final setup step to run once you have the image up:
  #
  
negative.code: # https://ghc.haskell.org/trac/ghc/wiki/Building/Hacking
  
  FROM debian:testing
  MAINTAINER Alexey Raga
  
  ## add ppa for ubuntu trusty haskell packages
  # from darinmorrison/haskell
  