anchor.diff:  RUN \
     curl -sL https://deb.nodesource.com/setup | bash - && \
     apt-get install -y nodejs
  -
  -# Compile ruby from source.
  -RUN \
  -  cd /tmp && \
  -  wget http://ftp.ruby-lang.org/pub/ruby/2.2/ruby-2.2.0.tar.gz && \
  -  tar -xzvf ruby-*.tar.gz && \
  -  rm -f ruby-*.tar.gz && \
  -  cd ruby-* && \
  -  ./configure --enable-shared --disable-install-doc && \
  -  make && \
  -  make install && \
  -  cd .. && \
  -  rm -rf ruby-*
   
   # Install ruby gems.
   RUN gem install awesome_print bundler rubygems-update --no-ri --no-rdoc
  
positive.code: #
  # Rails application dockerfile
  #
  # http://github.com/tenstartups/railsapp-docker
  #
  
  # Pull base image.
  FROM debian:jessie
  
  MAINTAINER Marc Lennox <marc.lennox@gmail.com>
  
  
negative.code: ENV PSQL_HISTORY /home/rails/.psql_history
  
  # Install base packages.
  RUN apt-get update && apt-get -y install \
    curl \
    ghostscript \
    git \
    imagemagick \
    graphviz \
    mysql-client \
    nano \
    sqlite3 \
    wget
  
  # Add postgresql client from official source.
  RUN \
  