anchor.diff:  
   RUN if [ ${INSTALL_OCI8} = true ]; then \
       # Install wget
  -    apt-get update && apt-get install --no-install-recommends -y wget \
  +    apt-get install --no-install-recommends -yqq wget \
       # Install Oracle Instantclient
       && mkdir /opt/oracle \
           && cd /opt/oracle \
  
positive.code: ARG INSTALL_IMAGE_OPTIMIZERS=false
  
  RUN if [ ${INSTALL_IMAGE_OPTIMIZERS} = true ]; then \
      apt-get install -y jpegoptim optipng pngquant gifsicle \
  ;fi
  
  ###########################################################################
  
negative.code: ARG INSTALL_WKHTMLTOPDF=false
  
  RUN if [ ${INSTALL_WKHTMLTOPDF} = true ]; then \
      apt-get install -yqq \
        libxrender1 \
        libfontconfig1 \
        libx11-dev \
        libjpeg62 \
        libxtst6 \
        fontconfig \
        libjpeg62-turbo \
        xfonts-base \
        xfonts-75dpi \
        wget \
      && wget https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6-1/wkhtmltox_0.12.6-1.stretch_amd64.deb \
      && dpkg -i wkhtmltox_0.12.6-1.stretch_amd64.deb \
      && apt -f install \
  