anchor.diff:  FROM mhart/alpine-node-auto:0.10
  +
  +ENV \
  +  HOME="/root" \
  +  LC_CTYPE="C.utf8" \
  +  PATH="$HOME/node_modules/.bin:$PATH"
  +WORKDIR $HOME
   
   # curl needed by the steps on Wercker CI
   # ruby, ruby-dev, and ruby-io-console needed by gem
  
positive.code:   && rm Gemfile* \
    ;
  
  ENV PATH="$HOME/node_modules/.bin:$PATH"
  
  CMD echo "print versions..."\
    && coffee --version \
    && compass --version \
  
negative.code:   ruby-io-console \
    sudo \
    ;
  
  # for Ruby gem
  ADD gemrc /etc/
  