anchor.diff:  # ANTS (https://github.com/stnava/ANTs)
   #-------------------------------------------------------------------------------
   RUN \
  -    if [ ! -e  ants ]; then \
  +    if [ ! -e $SOFT/ants ]; then \
           mkdir ants && \
           cd ants && \
           git clone https://github.com/stnava/ANTs.git -b $ANTS_VERSION  && \
  
positive.code: 
  # Set environment variables.
  ENV HOME /root
  ENV BASHRC $HOME/.bashrc
  
  # Define working directory.
  
negative.code: # Camino (http://camino.cs.ucl.ac.uk/)
  #-------------------------------------------------------------------------------
  RUN \
      if [ ! -e $SOFT/camino ]; then \
          git clone git://git.code.sf.net/p/camino/code camino \
      fi \
  
  