anchor.diff:  WORKDIR /home/ghc
   USER ghc
   
  -ENV PATH /opt/ghc/7.8.3/bin:/php/arcanist/bin:$PATH 
  +ENV PATH /opt/ghc/7.8.4/bin:/php/arcanist/bin:$PATH 
  
positive.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 python bzip2 ca-certificates \
   ## install minimal set of haskell packages
   # from darinmorrison/haskell
   ghc-7.8.3 \
   alex \
   cabal-install-1.20 \
   happy \
   # development conveniences
   sudo xutils-dev \
  
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
  