anchor.diff:  
   # Install Haskell
   RUN apt-get install -y ghc cabal-install
  -RUN cabal update
  -RUN cabal install hspec
  +RUN su codewarrior -c "cabal update"
  +RUN su codewarrior -c "cd ~codewarrior ; cabal install hspec"
   
   # Install Julia
   # Julia is really slow, but v0.3 is okay (see http://stackoverflow.com/a/20566032)
  
positive.code: ENV TERM linux
  RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections
  
  RUN apt-get install -y python python-dev python-pip python-virtualenv
  
  # Define mountable directories.
  
  # Install Node.js
  RUN \
    cd /tmp && \
    wget http://nodejs.org/dist/node-latest.tar.gz && \
    tar xvzf node-latest.tar.gz && \
    rm -f node-latest.tar.gz && \
    cd node-v* && \
    ./configure && \
    CXX="g++ -Wno-unused-local-typedefs" make && \
    CXX="g++ -Wno-unused-local-typedefs" make install && \
    cd /tmp && \
    rm -rf /tmp/node-v* && \
    echo '\n# Node.js\nexport PATH="node_modules/.bin:$PATH"' >> /root/.bash_profile
  
  
  # Define default command.
  CMD ["bash"]
  
negative.code: # Install Coffeescript
  RUN npm -g install coffee-script
  
  # Install Node testing frameworks & additional frameworks
  RUN npm -g install chai mocha immutable
  
  # Install Lua
  RUN apt-get install -y lua5.2
  