anchor.diff:    # Packages which cannot be installed due to lack of dependencies or other reasons.
     brokenPackages = [
       "av"
  -    "rgl"
       "NetLogoR"
       "x13binary"
       "valse"
  
positive.code:     "RcmdrPlugin_UCA"
      "recluster"
      "relimp"
      "rgl"
      "RHRV"
      "rich"
      "RNCEP"
  
negative.code:     });
  
      ChIPXpress = old.ChIPXpress.override { hydraPlatforms = []; };
  
      rgl = old.rgl.overrideDerivation (attrs: {
        RGL_USE_NULL = "true";
      });
    };
  in
    self
  