cmake_minimum_required(VERSION 3.9 FATAL_ERROR) add_subdirectory(./sha1) # we are running a custom msgpack serialization for hs2 if (NOT TARGET nlohmann_json::nlohmann_json) FetchContent_Declare(json URL https://github.com/nlohmann/json/releases/download/v3.11.3/json.tar.xz URL_HASH SHA256=d6c65aca6b1ed68e7a182f4757257b107ae403032760ed6ef121c9d55e81757d EXCLUDE_FROM_ALL ) FetchContent_MakeAvailable(json) endif()