anchor.diff:  
   RUN set -x \
       && apt-get -qq update \
  -    && apt-get install -qqy apt-utils \
  +    && apt-get install -qqy apt-transport-https apt-utils \
       && apt-get -qq upgrade \
       && apt-get -qq dist-upgrade \
  +    && curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
  +    && echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list \
  +    && apt-get -qq update \
       && apt-get install -qqy \
  +        acl \
           git \
           mercurial \
           rsync \
           subversion \
           sudo \
           wget \
  -
       # Restore a borne-shell compatible default shell
       && rm /bin/sh \
       && ln -s /bin/bash /bin/sh
   
   
  -    # install npm packages
  +# install npm packages
   RUN set -x \
  -    && rm -f /usr/local/bin/yarn \
       && npm install --silent --global \
           gulp-cli \
           grunt-cli \
           bower \
           markdown-styles \
  -        yarn \
       && npm upgrade --silent --global \
           gulp-cli \
           grunt-cli \
           bower \
           markdown-styles \
  -        yarn
  +    && curl --compressed -o- -L https://yarnpkg.com/install.sh | sh
   
   ##############################################################################
   # UTF-8 Locale, timezone
  
positive.code:     && echo "dev ALL=(ALL:ALL) NOPASSWD: ALL" >> /etc/sudoers \
      && rsync -a /root/ /home/dev/ \
      && chown -R dev:dev /home/dev/ \
      && chmod 0777 /home/dev
  
  ##############################################################################
  # ~ fin ~
  
negative.code:     && echo "export LC_ALL=$(echo $LC_ALL)"                    >> /root/.bash_profile \
      && echo "export TERM=xterm"                                >> /root/.bash_profile \
      && echo "export PATH=$(echo $PATH)"                        >> /root/.bash_profile \
      && echo "cd /src"                                          >> /root/.bash_profile \
      && echo "source \$HOME/.bashrc"                            >> /root/.bash_profile \
      # Add a dev user and configure
      && groupadd dev \
      && useradd dev -s /bin/bash -m -g dev \
  