anchor.diff:  { stdenv
   , fetchurl
  +, lib
   , patchelf
   }:
   
   let
  -  inherit (stdenv.lib)
  +  inherit (lib)
       makeSearchPath;
   
     libPath = makeSearchPath "lib" [
       stdenv.cc.libc
     ];
   
  -  version = "2.4.5";
  +  version = "2.5.6";
   in
   stdenv.mkDerivation rec {
     name = "resilio-${version}";
  
positive.code:   # FIXME
    sourceDateEpochWarn = true;
  
    meta = with stdenv.lib; {
      description = "Automatically sync files via secure, distributed technology";
      homepage = https://www.resilio.com/individuals/;
      license = licenses.unfreeRedistributable;
  
negative.code:   src  = fetchurl {
      url  = "https://download-cdn.resilio.com/${version}/"
        + "linux-x64/resilio-sync_x64.tar.gz";
      sha256 = "2940e7684b06ac21f2643eed63d20b5662b31731bf28e8e642fccfd3ebd59ad6";
    };
  
    nativeBuildInputs = [
  