anchor.diff:      mkdir /data/db
   
   # Install mongo packages for languages
  -RUN npm install mongoose
  -RUN npm install mongodb
  +RUN npm -g install mongoose mongodb
   RUN pip install pymongo
   RUN gem install mongo --no-ri --no-rdoc
   RUN gem install mongoid --no-ri --no-rdoc
  
positive.code: 
  # Install Haskell
  RUN apt-get install -y ghc cabal-install
  RUN cabal update
  RUN cabal install hspec
  
  # Install Julia
  # Julia is really slow, but v0.3 is okay (see http://stackoverflow.com/a/20566032)
  
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
  