anchor.diff:      scModels = [ pkgs.mpfr.dev ];
       multibridge = [ pkgs.mpfr.dev ];
       RcppCWB = with pkgs; [ pcre.dev glib.dev ];
  +    rrd = [ pkgs.rrdtool ];
     };
   
     packagesRequiringX = [
  
positive.code:     QF = [ pkgs.gsl ];
      PICS = [ pkgs.gsl ];
      RcppCWB = [ pkgs.pkg-config ];
    };
  
    packagesWithBuildInputs = {
  
negative.code:           --replace "-lsqlite3" "-L${lib.makeLibraryPath [ pkgs.sqlite ]} -lsqlite3"
        '';
      });
  
      rrd = old.rrd.overrideDerivation (attrs: {
        preConfigure = ''
          patchShebangs configure
        '';
      });
    };
  in
    self
  