anchor.diff:  
     # FIXME
     buildDirCheck = false;
  +
  +  passthru = {
  +    disk = cephDisk;
  +    volume = cephVolume;
  +  };
   
     meta = with stdenv.lib; {
       maintainers = with maintainers; [
  
positive.code:     # Bring in lib as a native build input
      mkdir -p "$out"/nix-support
      echo "$lib" > "$out"/nix-support/propagated-native-build-inputs
    '';
  
    preFixup = ''
  
negative.code: 
    inherit (sources)
      version;
  
    src = fetchurl {
      url = "https://github.com/wkennington/ceph/releases/download/${version}/ceph-${version}.tar.xz";
      inherit (sources) sha256;
    };
  
    cephDisk = python3Packages.buildPythonPackage {
      name = "ceph-disk-${version}";
  
      inherit src;
  
      prePatch = ''
        cd src/ceph-disk
      '';
    };
  
    cephVolume = python3Packages.buildPythonPackage {
      name = "ceph-volume-${version}";
  
      inherit src;
  
      prePatch = ''
        cd src/ceph-volume
      '';
    };
  in
  stdenv.mkDerivation rec {
    name = "ceph-${version}";
  
    inherit src;
  
    nativeBuildInputs = [
      cmake
  