anchor.diff:  # 0. install dependency for wkhtml2pdf
   RUN apt-get install -y fontconfig fontconfig-config fonts-dejavu-core \
   libfontconfig1 libfontenc1 libfreetype6 libjpeg-turbo8 libx11-6 libx11-data \
  -libxau6 libxcb1 libxdmcp6 libxext6 libxfont1 libxrender1\
  - x11-common xfonts-base xfonts-encodings xfonts-utils xfonts-75dpi 
  +libxau6 libxcb1 libxdmcp6 libxext6 libxfont2 libxrender1\
  + x11-common xfonts-base xfonts-encodings xfonts-utils xfonts-75dpi libssl1.0.0
   
   # 0. fix chinese/japanese/hindi font problem
   RUN apt-get install -y ttf-wqy-microhei fonts-indic
  
positive.code: FROM ubuntu:16.04
  
  # install necessary tools for setup
  RUN apt-get update; apt-get install -y curl software-properties-common
  
negative.code: # 0. setup python-2.7
  RUN apt-get -y install python-pip
  
  
  # 0. gunicorn
  RUN apt-get -y install gunicorn
  
  RUN curl -L -o libpng12-0.deb http://mirrors.kernel.org/ubuntu/pool/main/libp/libpng/libpng12-0_1.2.54-1ubuntu1_amd64.deb && curl -L -o wkhtmltox.deb https://downloads.wkhtmltopdf.org/0.12/0.12.5/wkhtmltox_0.12.5-1.xenial_amd64.deb && dpkg -i libpng12-0.deb wkhtmltox.deb
  
  RUN useradd -ms /bin/bash -G root web2pdf
  
  