anchor.diff:  # https://ghc.haskell.org/trac/ghc/wiki/Building/Hacking
   
   FROM debian:testing
  -MAINTAINER Greg Weber
  +MAINTAINER Alexey Raga
   
   ## add ppa for ubuntu trusty haskell packages
   # from darinmorrison/haskell
  
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:  # 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-3.4-dev python bzip2 ca-certificates \
   ## install minimal set of haskell packages
   # from darinmorrison/haskell
   ghc-7.8.4 \
   alex \
   cabal-install-1.22 \
   happy \
   # development conveniences
   sudo xutils-dev \
  