anchor.diff:    dnsutils \
     tree \
     dos2unix \
  -  zip
  +  zip \
  +  && apt-get clean \
  +  && apt-get autoremove -y --purge \
  +  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
   
   # Configure timezone and locale
   RUN echo "America/Toronto" > /etc/timezone; dpkg-reconfigure -f noninteractive tzdata
  
positive.code:   XC_OS=linux XC_ARCH=amd64 make updatedeps bin
  
  # Install jekyll + dependencies
  RUN apt-get install -y software-properties-common \
    && apt-add-repository -y ppa:brightbox/ruby-ng \
    && apt-get update \
    && apt-get install -y \
  
negative.code: FROM ubuntu:14.04
  
  # Install a bunch of utilities
  RUN apt-get update \
    && apt-get install -y git \
    python \
    curl \
    vim \
  