anchor.diff:  # PETPVC (https://github.com/UCL/PETPVC)
   #-------------------------------------------------------------------------------
   RUN \
  -    cd $HOME && \
  +    cd $SOFT && \
       mkdir petpvc && \
       cd petpvc && \
       git clone $PETPVC_GIT -b $PETPVC_VERSION && \
  
positive.code:     apt-key adv --recv-keys --keyserver hkp://pgp.mit.edu:80 0xA5D32F012649A5A9 && \
      apt-get update
  
  
  #-------------------------------------------------------------------------------
  # VTK (http://www.vtk.org)
  
negative.code: # https://afni.nimh.nih.gov/pub/dist/doc/htmldoc/background_install/install_instructs/steps_linux_ubuntu.html#install-steps-linux-ubuntu
  #-------------------------------------------------------------------------------
  RUN \
      cd $SOFT && \
      apt-get install -y tcsh xfonts-base python-qt4  && \
      apt-get install -y libxm4 libuil4 libmrm4 libmotif-common libmotif-dev motif-clients && \
      apt-get install -y gsl-bin netpbm gnome-tweak-tool libjpeg62 && \
  