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