anchor.diff:          extraConfig   = musnixRealtimeKernelExtraConfig;
         };
   
  -      linux_4_1_rt    = makeOverridable (import ../pkgs/os-specific/linux/kernel/linux-4.1-rt.nix) {
  +      linux_4_1_rt = makeOverridable (import ../pkgs/os-specific/linux/kernel/linux-4.1-rt.nix) {
           inherit fetchurl stdenv perl buildLinux;
           kernelPatches = [ kernelPatches.bridge_stp_helper
                             realtimePatches.realtimePatch_4_1
  
positive.code: 
      nixpkgs.config.packageOverrides = pkgs: with pkgs; rec {
  
        linux_3_14_rt   = makeOverridable (import ../pkgs/os-specific/linux/kernel/linux-3.14-rt.nix) {
          inherit fetchurl stdenv perl buildLinux;
          kernelPatches = [ kernelPatches.bridge_stp_helper
                            realtimePatches.realtimePatch_3_14
  
negative.code:         extraConfig   = musnixRealtimeKernelExtraConfig;
        };
  
        linux_opt = linux.override {
          extraConfig = musnixStandardKernelExtraConfig;
        };
  
        linuxPackages_3_14_rt = recurseIntoAttrs (linuxPackagesFor linux_3_14_rt linuxPackages_3_14_rt);
  