anchor.diff:      && cd paper-dict-master \
       && pip3 install --timeout=1000 -i "https://$PIP_MIRROR/simple" -r requirements.txt \
       && chmod +x paper-dict.py \
  -    && chmod +x paper-dict-folder.sh \
  -    && ln -s paper-dict.py /bin/paper-dict \
  -    && ln -s paper-dict-folder.sh /bin/paper-dict-folder
  +    && chmod +x paper-dict-folder.sh
   
   # Clean up APT when done.
   RUN apt-get autoremove \
       && apt-get autoclean \
       && apt-get clean \
       && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
  +
  +WORKDIR ./paper-dict-master
positive.code: RUN apt-get update && apt-get install -y \
          python3 \
          python3-pip \
          python3-reportlab \
          curl \
          libxml2-dev \
          libxslt-dev \
  
negative.code: # Use debian:jessie as base image.
  FROM debian:jessie
  
  MAINTAINER XiaoyangSun "xshaun@outlook.com"
  
  # allow replacing httpredir or deb mirror
  #
  