anchor.diff:  
     boinc = callPackage ../applications/science/misc/boinc { };
   
  +  celestia = callPackage ../applications/science/astronomy/celestia {
  +    lua = lua5_1;
  +    inherit (xlibs) libXmu;
  +    inherit (pkgs.gnome) gtkglext;
  +  };
  +
  +  gravit = callPackage ../applications/science/astronomy/gravit { };
  +
     golly = callPackage ../applications/science/misc/golly { };
   
  +  root = callPackage ../applications/science/misc/root { };
  +
     simgrid = callPackage ../applications/science/misc/simgrid { };
   
  +  spyder = callPackage ../applications/science/spyder {
  +    inherit (pythonPackages) pyflakes rope sphinx numpy scipy matplotlib; # recommended
  +    inherit (pythonPackages) ipython pep8; # optional
  +    inherit pylint;
  +  };
  +
  +  stellarium = callPackage ../applications/science/astronomy/stellarium { };
  +
     tulip = callPackage ../applications/science/misc/tulip { };
   
     vite = callPackage ../applications/science/misc/vite { };
   
  +  xplanet = callPackage ../applications/science/astronomy/xplanet { };
   
     ### MISC
   
  
positive.code: 
    eukleides = callPackage ../applications/science/math/eukleides { };
  
    gap = callPackage ../applications/science/math/gap { };
  
    maxima = callPackage ../applications/science/math/maxima { };
  
negative.code: 
    ### SCIENCE
  
    ### SCIENCE/GEOMETRY
  
    drgeo = builderDefsPackage (import ../applications/science/geometry/drgeo) {
  