{kotlin-language-server}:
kotlin-language-server.overrideAttrs {
  src = fetchTarball {
    url = "https://f.freya.cat/bin/kotlin-language-server.tar.gz";
    sha256 = "14bcah09dsgx4frffl2k9cppjqgpn1q0pnx6bpx2qlz9wiw4kwzs";
  };
}