anchor.diff:  # ITK
   #-------------------------------------------------------------------------------
   # RUN \
  +#     cd $HOME && \
   #     mkdir itk && \
   #     cd itk && \
   #     git clone $ITK_GIT -b $ITK_VERSION && \
  
positive.code: # Camino (http://camino.cs.ucl.ac.uk/)
  #-------------------------------------------------------------------------------
  RUN \
      git clone $CAMINO_GIT camino
  
  RUN \
  
negative.code: # ANTS (https://github.com/stnava/ANTs)
  #-------------------------------------------------------------------------------
  RUN \
      cd $HOME && \
      mkdir ants && \
      cd ants && \
      git clone $ANTS_GIT -b $ANTS_VERSION ANTs && \
  