在我的CMakelists.txt文件中，我指定：
set (CMAKE_MODULE_PATH “${<ProjectName>_SOURCE_DIR}/cmake_modules”)
在我的项目根目录中，有一个名为cmake_modules的子目录，其中有一个名为FindLibUSB.cmake的文件，但是当我运行cmake时，我收到以下错误：
By not providing "FindLibUSB.cmake" in CMAKE_MODULE_PATH this project has asked CMake to find a package configuration file provided by "LibUSB", but CMake did not find one.
为什么无法找到该文件？在我看来，它的名字正确，它位于正确的位置，cmake知道在哪里看。
这里是CMakeLists.txt：
cmake_minimum_required (VERSION 2.8.12.1)
project (Connected-Room)
set (Connected-Room_VERSION_MAJOR 0)
set (Connected-Room_VERSION_MINOR 1)
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
list (APPEND CMAKE_PREFIX_PATH "/Users/<username>/kinect2/libfreenect2/build/")
list (APPEND CMAKE_MODULE_PATH “${Connected-Room_SOURCE_DIR}/cmake_modules”)
Message ("CMAKE_MODULE_PATH: " ${CMAKE_MODULE_PATH})
find_package (LibUSB REQUIRED)
find_package (OpenCV REQUIRED)
find_package (Boost COMPONENTS system REQUIRED)
find_package (libfreenect2 REQUIRED)