anchor.diff:      gperf \
       perl \
       libsqlite3-dev \
  +    libmysqlclient-dev \
  +    mysql-client \
  +    libfontconfig1 \
       libfontconfig1-dev \
       libicu-dev \
       libfreetype6 \
  +    libfreetype6-dev \
       libssl-dev \
  +    libxft-dev \
       libpng-dev \
  -    libjpeg-dev \
  -    libqt5webkit5-dev
  +    libjpeg-dev
   
   # for image manipulation
   RUN apt-get install -y imagemagick
  
positive.code: FROM ruby:2.3.0-slim
  
  ENV PHANTOM_JS_TAG 2.0.0
  
  RUN apt-get update -qq && apt-get upgrade -y && apt-get install -y \
      git \
      build-essential \
      g++ \
      flex \
  
negative.code: # for capybara-webkit
  RUN apt-get install -y libqt4-webkit libqt4-dev xvfb
  
  # phantomjs
  RUN npm install -g phantomjs-prebuilt
  
  ENV APP_HOME /myapp
  RUN mkdir $APP_HOME
  