anchor.diff:  
         ${optionalString needsPatchelf ''
           patchelf \
  +          --set-rpath "${stdenv.lib.makeLibraryPath [ curl zlib ]}" \
             --set-interpreter $(cat $NIX_CC/nix-support/dynamic-linker) \
             "$out/bin/cargo"
         ''}
  
positive.code: 
    bootstrapHash =
      if stdenv.system == "x86_64-linux"
      then "1v7jvwigb29m15wilzcrk5jmlpaccpzbkhlzf7z5qw08320gvc91"
      else throw "missing bootstrap hash for platform ${stdenv.system}";
  
    needsPatchelf = stdenv.isLinux;
  
negative.code: { stdenv, fetchurl, makeWrapper, cacert, zlib, buildRustPackage, curl }:
  
  let
    inherit (stdenv.lib) optionalString;
  