anchor.diff:  
   # Install wkhtmltopdf
   RUN cd /tmp && \
  -    wget -O http://wkhtmltopdf.googlecode.com/files/wkhtmltopdf-0.9.9-static-amd64.tar.bz2 && \
  -    tar xvjf wkhtmltopdf-0.9.9-static-amd64.tar.bz2 \ 
  -    mv wkhtmltopdf-amd64 /usr/bin/wkhtmltopdf \
  +    wget http://wkhtmltopdf.googlecode.com/files/wkhtmltopdf-0.9.9-static-amd64.tar.bz2 && \
  +    tar xvjf wkhtmltopdf-0.9.9-static-amd64.tar.bz2 && \ 
  +    mv wkhtmltopdf-amd64 /usr/bin/wkhtmltopdf && \
       chmod +x /usr/bin/wkhtmltopdf
   
   # Install pip
  
positive.code:     python-openssl \
      python-paramiko \
      python-pdftools \
      python-psutil \
      python-psycopg2 \
      python-pybabel \
  
negative.code:     python-werkzeug \
      python-xlwt \
      python-yaml \
      python-zbar \
      python-zsi \
      qrencode \
      wget \
      xmlstarlet \ 
      xsltproc \
      zbar-tools 
  