anchor.diff:                            libwebp-dev \
                             zlib1g \
                             zlib1g-dev \
  -    && mkdir libxml2 \
  -        && curl -sSL ftp://xmlsoft.org/libxml2/libxml2-2.9.2.tar.gz | tar xz --strip 1 -C libxml2 \
  -        && cd libxml2 \
  -        && ./configure --prefix=/usr \
  -        && make \
  -        && make install \
  -        && ldconfig \
  -        && cd .. \
  -        && rm -rf libxml2 \
  -    && mkdir libxslt \
  -        && curl -sSL https://git.gnome.org/browse/libxslt/snapshot/libxslt-1.1.28.tar.xz | tar xJ --strip 1 -C libxslt \
  -        && cd libxslt \
  -        && ./autogen.sh --prefix=/usr \
  -        && make \
  -        && make install \
  -        && ldconfig \
  -        && cd .. \
  -        && rm -rf libxslt \
       && curl -sSL https://bootstrap.pypa.io/get-pip.py | python \
       && pip install git+https://github.com/scrapy/scrapy.git \
                      git+https://github.com/scrapy/scrapyd.git \
  
positive.code:                                       libffi-dev \
                                        libssl-dev \
                                        libtool \
                                        python-dev \
      && apt-get purge -y --auto-remove libtiff5-dev \
                                        libfreetype6-dev \
  
negative.code:                           libffi-dev \
                            libssl-dev \
                            libtool \
                            libxml2 \
                            libxml2-dev \
                            libxslt1.1 \
                            libxslt1-dev \
                            python \
                            python-dev \
                            vim-tiny \
  