anchor.diff:  }:
   
   assert builtins.elem type [ "aspnetcore" "runtime" "sdk"];
  -{ lib, stdenv
  +{ lib
  +, stdenv
   , fetchurl
   , libunwind
   , openssl
  
positive.code:   inherit pname version;
  
    # Some of these dependencies are `dlopen()`ed.
    rpath = lib.makeLibraryPath [
      stdenv.cc.cc
      lttng-ust_2_12
      zlib
  
      curl
  
negative.code:     libunwind
      libuuid
      openssl
    ] ++ lib.optionals stdenv.isLinux [
      lttng-ust_2_12
    ]);
  
    src = fetchurl {
      url = builtins.getAttr type urls;
  