anchor.diff:  
     enableParallelBuilding = true;
   
  -  meta = with stdenv.lib; {
  +  meta = with lib; {
       homepage = "https://github.com/gperftools/gperftools";
       description = "Fast, multi-threaded malloc() and nifty performance analysis tools";
       platforms = with platforms; linux ++ darwin;
  
positive.code:   nativeBuildInputs = [ autoreconfHook ];
  
    # tcmalloc uses libunwind in a way that works correctly only on non-ARM linux
    buildInputs = stdenv.lib.optional (stdenv.isLinux && !(stdenv.isAarch64 || stdenv.isAarch32)) libunwind;
  
    # Disable general dynamic TLS on AArch to support dlopen()'ing the library:
    # https://bugzilla.redhat.com/show_bug.cgi?id=1483558
    configureFlags = stdenv.lib.optional (stdenv.isAarch32 || stdenv.isAarch64)
      "--disable-general-dynamic-tls";
  
    prePatch = stdenv.lib.optionalString stdenv.isDarwin ''
      substituteInPlace Makefile.am --replace stdc++ c++
      substituteInPlace Makefile.in --replace stdc++ c++
      substituteInPlace libtool --replace stdc++ c++
    '';
  
    NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.isDarwin
      "-D_XOPEN_SOURCE";
  
    # some packages want to link to the static tcmalloc_minimal
  
negative.code: { stdenv, lib, fetchurl, fetchpatch, autoreconfHook, libunwind }:
  
  stdenv.mkDerivation rec {
    name = "gperftools-2.8";
  