anchor.diff:    && \
       if [ "${WITH_PLUGINS}" = "true" ]; then \
         pip install --no-cache-dir \
  -        'mkdocs-minify-plugin>=0.3' \
  -        'mkdocs-redirects>=1.0'; \
  +        "mkdocs-minify-plugin>=0.3" \
  +        "mkdocs-redirects>=1.0"; \
       fi \
     && apk del .build gcc musl-dev \
     && \
  
positive.code:         ${PACKAGES}/material \
          ${PACKAGES}/mkdocs/themes/$theme; \
      done \
    && rm -rf /tmp/*
  
  # Set working directory
  WORKDIR /docs
  
negative.code: # Build-time flags
  ARG WITH_PLUGINS=true
  
  # Environment variables
  ENV PACKAGES=/usr/local/lib/python3.8/site-packages
  ENV PYTHONDONTWRITEBYTECODE=1
  
  # Set build directory
  WORKDIR /tmp
  