anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "lttng-ust";
  -  version = "2.10.5";
  +  version = "2.13.0";
   
     src = fetchurl {
       url = "https://lttng.org/files/lttng-ust/${pname}-${version}.tar.bz2";
  -    sha256 = "0ddwk0nl28bkv2xb78gz16a2bvlpfbjmzwfbgwf5p1cq46dyvy86";
  +    sha256 = "0l0p6y2zrd9hgd015dhafjmpcj7waz762n6wf5ws1xlwcwrwkr2l";
     };
   
  -  buildInputs = [ python3 ];
  +  nativeBuildInputs = [ pkg-config ];
  +  buildInputs = [ numactl python3 ];
   
     preConfigure = ''
       patchShebangs .
  
positive.code: { lib, stdenv, fetchurl, liburcu, python3 }:
  
  # NOTE:
  #   ./configure ...
  
negative.code: 
    propagatedBuildInputs = [ liburcu ];
  
    enableParallelBuilding = true;
  
    meta = with lib; {
      description = "LTTng Userspace Tracer libraries";
      homepage = "https://lttng.org/";
      license = with licenses; [ lgpl21Only gpl2Only mit ];
      platforms = platforms.linux;
      maintainers = [ maintainers.bjornfor ];
    };
  