anchor.diff:      && rbenv global ${DEFAULT_RUBY_VERSION}
   
   # Install pyenv
  -RUN git clone --depth=1 https://github.com/pyenv/pyenv.git ~/.pyenv \
  -    && cd /root/.pyenv \
  +ENV PYENV_ROOT=/root/.pyenv
  +RUN git clone --depth=1 https://github.com/pyenv/pyenv.git $PYENV_ROOT \
  +    && cd $PYENV_ROOT \
       && src/configure \
       && make -C src
  -ENV PATH /root/.pyenv/shims:/root/.pyenv/bin:$PATH
  +ENV PATH $PYENV_ROOT/shims:$PYENV_ROOT/bin:$PATH
   RUN echo 'export PYENV_ROOT="$HOME/.pyenv"' >> .bashrc
   RUN echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> .bashrc
   RUN echo 'eval "$(pyenv init -)"' >> ~/.bashrc
  
positive.code:     && apt-get -y autoclean
  
  # Install rbenv
  RUN git clone --depth=1 https://github.com/rbenv/rbenv.git /root/.rbenv \
      && cd /root/.rbenv \
      && src/configure \
      && make -C src
  ENV PATH /root/.rbenv/shims:/root/.rbenv/bin:$PATH
  RUN echo 'eval "$(rbenv init -)"' >> /etc/profile
  RUN echo 'eval "$(rbenv init -)"' >> .bashrc
  RUN mkdir -p "$(rbenv root)"/plugins \
  
negative.code:     && ln -s $(which python) /bin/python3
  
  # Install nodenv
  ENV NODENV_ROOT=/root/.nodenv
  RUN git clone --depth=1 https://github.com/nodenv/nodenv.git $NODENV_ROOT \
      && cd $NODENV_ROOT \
      && src/configure \
      && make -C src
  ENV PATH $NODENV_ROOT/shims:$NODENV_ROOT/bin:$PATH
  RUN echo 'export PATH="$HOME/.nodenv/bin:$PATH"' >> ~/.bashrc
  RUN echo 'eval "$(nodenv init -)"' >> ~/.bashrc
  RUN mkdir -p "$(nodenv root)"/plugins \
  