anchor.diff:      echo 'linuxbrew ALL=(ALL) NOPASSWD:ALL' >>/etc/sudoers
   RUN source /etc/profile && \
       git clone --depth=1 https://github.com/Linuxbrew/brew /home/linuxbrew/.linuxbrew && \
  -    git clone --depth=1 https://github.com/Linuxbrew/homebrew-core /home/linuxbrew/.linuxbrew/Library/Taps/homebrew/homebrew-core && \
  -    git clone --depth=1 https://github.com/xu-cheng/homebrew-portable /home/linuxbrew/.linuxbrew/Library/Taps/xu-cheng/homebrew-portable && \
  -    ln -s $(which gcc) /home/linuxbrew/.linuxbrew/bin/gcc-$(gcc -dumpversion | cut -d. -f1,2) && \
  -    ln -s $(which g++) /home/linuxbrew/.linuxbrew/bin/g++-$(g++ -dumpversion | cut -d. -f1,2) && \
  +    git clone --depth=1 https://github.com/Linuxbrew/homebrew-core \
  +        /home/linuxbrew/.linuxbrew/Library/Taps/homebrew/homebrew-core && \
  +    git clone --depth=1 https://github.com/xu-cheng/homebrew-portable \
  +        /home/linuxbrew/.linuxbrew/Library/Taps/xu-cheng/homebrew-portable && \
  +    ln -s $(which gcc) /home/linuxbrew/.linuxbrew/bin/gcc-$(gcc -dumpversion|cut -d. -f1,2) && \
  +    ln -s $(which g++) /home/linuxbrew/.linuxbrew/bin/g++-$(g++ -dumpversion|cut -d. -f1,2) && \
       chown -R linuxbrew:linuxbrew /home/linuxbrew/.linuxbrew
   USER linuxbrew
   WORKDIR /home/linuxbrew
  -ENV PATH=/home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin:/opt/rbenv/bin:$PATH SHELL=/bin/bash
  +ENV PATH=/home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin:/opt/rbenv/bin:$PATH \
  +    SHELL=/bin/bash
  
positive.code:     rpm -i rpmforge-release-0.5.3-1.el5.rf.x86_64.rpm
  RUN yum install git python-setuptools libyaml-devel openssl-devel readline-devel zlib-devel -y
  RUN git clone --depth=1 https://github.com/rbenv/rbenv.git /opt/rbenv && \
      echo 'export PATH=/opt/rbenv/bin:$PATH; export RBENV_ROOT=/opt/rbenv/var/rbenv; eval "$(rbenv init -)"' >>/etc/profile && \
      echo 'source /etc/profile' >>/etc/bashrc
  RUN source /etc/profile && \
      git clone --depth=1 https://github.com/rbenv/ruby-build.git /opt/rbenv/plugins/ruby-build && \
      (cd /opt/rbenv/plugins/ruby-build; ./install.sh) && \
      rbenv install 2.0.0-p648 && \
      rbenv global 2.0.0-p648
  
negative.code: MAINTAINER Xu Cheng <xucheng@me.com>
  
  RUN yum groupinstall 'Development Tools' -y
  RUN yum install sudo vim curl which -y
  RUN curl http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el5.rf.x86_64.rpm \
           -L -o rpmforge-release-0.5.3-1.el5.rf.x86_64.rpm && \
      rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt && \
  