anchor.diff:    pgf1 = callPackage ../tools/typesetting/tex/pgf/1.x.nix { };
   
     pgf2 = callPackage ../tools/typesetting/tex/pgf/2.x.nix { };
  -  
  +
     pgfplots = callPackage ../tools/typesetting/tex/pgfplots { };
   
     pjsip = callPackage ../applications/networking/pjsip { };
  
positive.code:   oidentd = callPackage ../servers/identd/oidentd { };
  
    openfire = callPackage ../servers/xmpp/openfire { };
   
    OVMF = callPackage ../applications/virtualization/OVMF { };
  
    postgresql = postgresql83;
  
negative.code: 
    xf86_input_wacom = callPackage ../os-specific/linux/xf86-input-wacom { };
  
    xf86_video_nouveau = callPackage ../os-specific/linux/xf86-video-nouveau {
      inherit (xorg) xorgserver xproto fontsproto xf86driproto renderproto
        videoproto utilmacros;
    };
  