anchor.diff:          libyaml-dev \
           procps \
           zlib1g-dev \
  -        git-core \
       && rm -rf /var/lib/apt/lists/*
   
   ENV RUBY_MAJOR 2.2
  
positive.code: ######### 2. 安装sass                                  ####
  ######### 3. 安装compass                               ####
  ###########################################################
  # apt-get git-core
  # && gem sources --remove https://rubygems.org/ \
  # && gem sources -a https://ruby.taobao.org/ \
  # && gem install sass \
  
negative.code:     && npm install intern \
      && npm install -g mocha \
      && npm install -g eslint \
      && npm install ghooks --save-dev \
      && apt-get purge -y --auto-remove git-core \
      && rm -rf /var/lib/apt/lists/*
  
  # Define working directory.
  WORKDIR /var/www
  