> include：从给定文件中读取CMake列表文件代码.

include(<file|module> [OPTIONAL] [RESULT_VARIABLE <VAR>]
                    [NO_POLICY_SCOPE])

使用示例：

的CMakeLists.txt：

cmake_minimum_required(VERSION 2.8)
include (Project.txt)

Project.txt：

project (Project)
add_executable(Project project.c)