anchor.diff:    libical = import ../development/libraries/libical {
       inherit stdenv fetchurl perl;
     };
  -  
  +
     libQGLViewer = import ../development/libraries/libqglviewer {
       inherit fetchurl stdenv;
       inherit qt4;
  
positive.code:   pyqt4 = import ../development/python-modules/pyqt {
      inherit stdenv fetchurl python sip qt4;
    };
    
    pyx = import ../development/python-modules/pyx {
      inherit fetchurl stdenv python makeWrapper;
    };
  
negative.code:     inherit stdenv fetchurl pkgconfig;
      inherit (gtkLibs) glib;
    };
  
    dev86 = import ../development/compilers/dev86 {
      inherit fetchurl stdenv;
    };
  