cmake_minimum_required(VERSION 3.2) project(rapidjson-download NONE) include(ExternalProject) ExternalProject_Add(rapidjson DOWNLOAD_COMMAND git clone --depth 1 https://github.com/Tencent/rapidjson.git . DOWNLOAD_DIR "${CMAKE_BINARY_DIR}/${DEPENDENCY_DIR}/rapidjson/src" CONFIGURE_COMMAND "" BUILD_COMMAND "" INSTALL_COMMAND "" TEST_COMMAND "" GIT_SUBMODULES "" )