anchor.diff:  
   ## Install Clang 3.4, Boost and utilities
   RUN apt-get install -y \
  -      wget vim make git \
  +      wget vim emacs make git mercurial \
         zlib1g-dev libreadline6 libreadline6-dev libncurses5-dev libgmp-dev \
         clang-3.4 libboost1.55-all-dev 
   
  
positive.code: RUN mkdir /software
  
  # Update apt-get
  RUN apt-get update
  
  # Locale setup
  RUN apt-get install -y language-pack-en-base
  
negative.code: ## Download and Build nanomsg
  RUN mkdir -p /software/nanomsg/build
  WORKDIR /software/nanomsg/build
  RUN wget --no-verbose http://download.nanomsg.org/nanomsg-0.3-beta.tar.gz && \
      tar -xvzf nanomsg-0.3-beta.tar.gz && \
      ./nanomsg-0.3-beta/configure --prefix /software/nanomsg && \
      make && make install && \
  