anchor.diff:      && gosu app python -m venv /python \
       && gosu app /python/bin/pip install --no-cache-dir pip setuptools wheel
   
  -ENV PATH=/python/bin:${PATH} \
  -    XDG_CACHE_HOME=/python/cache \
  -    PYTHONENV=/python \
  +ENV LANG=C \
  +    LC_COLLATE=C \
  +    DEBIAN_FRONTEND=noninteractive \
  +    PATH="/python/bin:${PATH}" \
  +    XDG_CACHE_HOME="/python/cache" \
  +    PYTHONENV="/python" \
  +    PYTHONBUFFERED=1 \
  +    PYTHONHASHSEED=random \
       PIP_TIMEOUT=60 \
       PIP_DISABLE_PIP_VERSION_CHECK=true
   
  
positive.code:     && rm -rf /var/cache/* \
      && rm -rf /usr/share/man/* \
      && rm -rf /usr/share/doc/* \
      && rm -rf /var/lib/apt/lists/*
  
  RUN set -x \
      && useradd --uid 1000 --user-group app \
      && mkdir -p /app \
      && mkdir -p /python \
  
negative.code: FROM python:3.6-slim
  
  
  RUN set -ex \
      && apt-get update \
      && apt-get install -q -y --no-install-recommends wget ca-certificates \
      && rm -rf /var/lib/apt/lists/* \
      && wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/1.10/gosu-$(dpkg --print-architecture)" \
      && wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/1.10/gosu-$(dpkg --print-architecture).asc" \
      && export GNUPGHOME="$(mktemp -d)" \
      && gpg --keyserver ha.pool.sks-keyservers.net --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4 \
      && gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu \
      && rm -r "$GNUPGHOME" /usr/local/bin/gosu.asc \
      && chmod +x /usr/local/bin/gosu \
      && gosu nobody true
  
  RUN set -ex \
      && apt-get update -y \
      && apt-get install -q -y --no-install-recommends \
          git gcc make gettext gdal-bin \
          libc6-dev zlib1g-dev musl-dev \
          libpq-dev libxml2-dev libxslt1-dev \
          libpng-dev libfreetype6-dev libjpeg-dev libffi-dev \
  