anchor.diff:  # Install pt (does not work...)
   # ------------------
   RUN cd $HOME && \
  -    /usr/local/go/bin/go get -u github.com/monochromegane/the_platinum_searcher/... && \
       curl -L https://github.com/monochromegane/the_platinum_searcher/releases/download/v2.1.5/pt_linux_amd64.tar.gz | tar zxv && \
       cp pt_linux_amd64/pt /usr/local/bin && \
       rm -rf pt_linux_amd64
  
positive.code: # ------------------
  # Install antigen
  # ------------------
  RUN curl -L https://cdn.rawgit.com/zsh-users/antigen/v1.4.0/bin/antigen.zsh > $HOME/antigen.zsh
  
  # ------------------
  # Install universal-ctags
  
negative.code: # ------------------
  # Install Go
  # ------------------
  RUN cd $HOME && \
      mkdir $HOME/.go && \
      curl -L https://storage.googleapis.com/golang/go1.7.5.linux-amd64.tar.gz | tar zxv && \
  