anchor.diff:    CXX = "${stdenv.cc.targetPrefix}c++";
     CXXCPP = "${stdenv.cc.targetPrefix}c++ -E";
   
  -  doCheck = true;
  +  # takes 14 minutes on a 24 core and because many other packages depend on curl
  +  # they cannot be run concurrently and are a bottleneck
  +  # tests are available in passthru.tests.withCheck
  +  doCheck = false;
     preCheck = ''
       patchShebangs tests/
     '' + lib.optionalString stdenv.isDarwin ''
  
positive.code: , ocamlPackages
  , phpExtensions
  , python3
  }:
  
  # Note: this package is used for bootstrapping fetchurl, and thus
  
negative.code:   in {
      inherit opensslSupport openssl;
      tests = {
        withCheck = finalAttrs.finalPackage.overrideAttrs (_: { doCheck = true; });
        fetchpatch = tests.fetchpatch.simple.override { fetchpatch = fetchpatch.override { fetchurl = useThisCurl fetchurl; }; };
        curlpp = useThisCurl curlpp;
        coeurl = useThisCurl coeurl;
        haskell-curl = useThisCurl haskellPackages.curl;
  