anchor.diff:      56730D5401028683275BD23C23EFEFE93C4CFFFE \
       77984A986EBC2AA786BC0F66B01FBB92821C587A \
     ; do \
  -    gpg --keyserver pgp.mit.edu --recv-keys "$key" || \
  -    gpg --keyserver keyserver.pgp.com --recv-keys "$key" || \
  -    gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key" ; \
  +    gpg --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys "$key" || \
  +    gpg --keyserver hkp://ipv4.pool.sks-keyservers.net --recv-keys "$key" || \
  +    gpg --keyserver hkp://pgp.mit.edu:80 --recv-keys "$key" ; \
     done
   
  -ENV NODE_VERSION 6.12.0
  -
  -RUN buildDeps='xz-utils' \
  -    && ARCH= && dpkgArch="$(dpkg --print-architecture)" \
  +RUN ARCH=  && dpkgArch="$(dpkg --print-architecture)" \
       && case "${dpkgArch##*-}" in \
         amd64) ARCH='x64';; \
         ppc64el) ARCH='ppc64le';; \
  
positive.code: FROM python:2.7-slim-jessie
  
  # extra python env
  ENV PYTHONDONTWRITEBYTECODE=1
  ENV PYTHONUNBUFFERED=1
  ENV PIP_DISABLE_PIP_VERSION_CHECK=1
  # disable this when preparing for Django upgrade
  ENV PYTHONWARNINGS=ignore
  
  # ----------------------------------------------------------------------------
  # add node.js 6.12, copied from:
  #     https://github.com/nodejs/docker-node/blob/master/6.12/slim/Dockerfile
  # but with curl added to the list of packages installed.
  # ----------------------------------------------------------------------------
  RUN set -ex \
    && for key in \
      94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
  
negative.code:         clean-css@3.4.23 \
          stylelint@7.10.1
  
  COPY ./requirements /app/requirements
  RUN pip install --no-cache-dir -r requirements/dev.txt
  
  