anchor.diff:      # WITH_OPENCL_SVM
       #"-DWITH_OPENEXR=${boolOn (openexr != null)}"
       /**/"-DWITH_OPENEXR=OFF"
  -    "-DWITH_OPENGL=${boolOn (mesa != null)}"
  +    "-DWITH_OPENGL=${boolOn (opengl-dummy != null)}"
       # WITH_OPENMP
       # WITH_OPENNI
       # WITH_OPENNI2
  
positive.code:     libraw1394
      libtiff
      libwebp
      mesa
      #openexr
      pango
      #python2Packages.numpy
      #python2Packages.python
  
negative.code: , libraw1394
  , libtiff
  , libwebp
  , opengl-dummy
  #, nvidia-cuda-toolkit
  #, openexr
  , pango
  