anchor.diff:    DEBIAN_FRONTEND=noninteractive \
     TERM=xterm-color
   
  -# Install base packages.
  -RUN apt-get update && apt-get -y install \
  -  build-essential \
  -  curl \
  -  nano \
  -  wget
  -
  -# Clean up APT when done.
  -RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
  +# Install packages.
  +RUN apk --update add build-base ruby-dev bash curl nano wget
   
   # Install ruby gems.
   RUN gem install colorize hipchat rest-client slack-notifier --no-ri --no-rdoc
  
positive.code: # http://github.com/tenstartups/notifier-docker
  #
  
  FROM ruby:slim
  
  MAINTAINER Marc Lennox <marc.lennox@gmail.com>
  
  
negative.code: 
  # Copy scripts and configuration into place.
  RUN \
    find ./script -type f -name '*.sh' | while read f; do echo 'n' | cp -iv "$f" "/usr/local/bin/`basename ${f%.sh}`" 2>/dev/null; done && \
    find ./script -type f -name '*.rb' | while read f; do echo 'n' | cp -iv "$f" "/usr/local/bin/`basename ${f%.rb}`" 2>/dev/null; done && \
    rm -rf ./script
  
  # Define entrypoint script.
  