anchor.diff:  # composer is a package manager for PHP apps
   RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/bin/
   RUN mv /usr/bin/composer.phar /usr/bin/composer
  -
  -# download the CF-CLI
  -RUN wget -O cf-cli.tgz 'https://packages.cloudfoundry.org/stable?release=linux64-binary&version=6.40.0&source=github-rel' \
  -  && [ de34bb9755ec9f9ca9605b14c690a9013157cc3c83fc647beb2c842a03c8b5b2 = $(shasum -a 256 cf-cli.tgz | cut -d' ' -f1) ] \
  -  && tar xzf cf-cli.tgz -C /usr/bin \
  -  && rm cf-cli.tgz \
  -  && cf install-plugin -r CF-Community "log-cache" -f
   
   # download the bosh2 CLI
   RUN curl https://s3.amazonaws.com/bosh-cli-artifacts/bosh-cli-2.0.45-linux-amd64 -o /usr/local/bin/bosh2 \
  
positive.code:   python-dev \
    python-pip \
    shellcheck \
    vim \
    wget \
    zip \
  
negative.code: 
  RUN curl -sL "https://keybase.io/crystal/pgp_keys.asc" | apt-key add - \
      && echo "deb https://dist.crystal-lang.org/apt crystal main" | tee /etc/apt/sources.list.d/crystal.list
  
  RUN curl -sL "https://packages.cloudfoundry.org/debian/cli.cloudfoundry.org.key" | apt-key add - \
    && echo "deb https://packages.cloudfoundry.org/debian stable main" | tee /etc/apt/sources.list.d/cloudfoundry-cli.list
  
  RUN apt-get update \
    && apt-get -y install \
  