anchor.diff:    ];
   
     configureFlags = [
  -    "--with-gssapi_krb5"
  +    "--with-libgssapi_krb5"
       "--with-libsodium"
  -    # "--with-pgm" # TODO: Implement
     ];
   
     passthru = {
  
positive.code: }:
  
  let
    version = "4.2.2";
  in
  stdenv.mkDerivation rec {
    name = "zeromq-${version}";
  
negative.code:     url = "https://github.com/zeromq/libzmq/releases/download/v${version}/"
        + "${name}.tar.gz";
      hashOutput = false;
      sha256 = "8f1e2b2aade4dbfde98d82366d61baef2f62e812530160d2e6d0a5bb24e40bc0";
    };
  
    buildInputs = [
      krb5_lib
  