anchor.diff:    ];
   
     buildInputs = [
  -    boost_1-66
  +    boost'
       curl
       expat
       fuse_2
  
positive.code: 
  let
    inherit (stdenv.lib)
      replaceChars;
  
    sources = (import ./sources.nix)."${channel}";
  
negative.code:     postPatch = ''
        grep -q 'locations = (' ceph_volume/util/system.py
        sed -i "/locations = (/a\        '/run/current-system/sw/bin'," ceph_volume/util/system.py
      '';
    };
  
    boosts = [
      boost_1-66
      python2Packages.boost_1-66
    ];
  
    boost' = stdenv.mkDerivation {
      name = "ceph-combined-${(head boosts).name}";
  
      buildCommand = ''
        mkdir -p "$out"
        cp -ans --no-preserve=mode ${concatMapStrings (n: "${n.lib}/lib ") boosts}"$out"
        mkdir -p "$out"/nix-support
        echo '${concatMapStrings (n: "${n.dev} ") boosts}' >"$out"/nix-support/propagated-native-build-inputs
      '';
    };
  in
  