anchor.diff:      inherit fetchurl stdenv ncurses;
     };
   
  -  calibre = import ../applications/misc/calibre {
  +  calibre = makeOverridable (import ../applications/misc/calibre) {
       inherit stdenv fetchurl libpng imagemagick pkgconfig libjpeg fontconfig podofo
  -      qt4 makeWrapper unrar sip pyqt4 pil chmlib;
  +      qt4 makeWrapper unrar pil chmlib;
       python = python26Full;
       popplerQt4 = popplerQt45;
  +    pyqt4 = pyqt45;
  +    sip = sip48;
       inherit (python26Packages) mechanize lxml dateutil cssutils beautifulsoap;
  +  };
  +
  +  calibreQt46 = calibre.override {
  +    popplerQt4 = popplerQt46;
  +    pyqt4 = pyqt47;
  +    sip = sip410;
     };
   
     carrier = builderDefsPackage (import ../applications/networking/instant-messengers/carrier/2.5.0.nix) {
  
positive.code:     inherit stdenv fetchurl python;
    };
  
    pyqt4 = pyqt45;
    
    pyqt45 = import ../development/python-modules/pyqt {
      inherit stdenv fetchurl python sip;
      qt4 = qt45;
    };
  
    pyqt47 = import ../development/python-modules/pyqt/4.7.nix {
  
negative.code:     inherit stdenv fetchurl rpm cpio python wirelesstools gettext;
    };
  
    sip48 = import ../development/python-modules/python-sip {
      inherit stdenv fetchurl python;
    };
  