cmake opencv 路径问题_"add the installation prefix of \"opencv\" to cmak

cmake配置出现如下问题：

CMake Error at CMakeLists.txt:12 (find_package):
By not providing "FindOpenCV.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "OpenCV", but
CMake did not find one.
Could not find a package configuration file provided by "OpenCV" with any
of the following names:
OpenCVConfig.cmake
opencv-config.cmake
Add the installation prefix of "OpenCV" to CMAKE_PREFIX_PATH or set
"OpenCV_DIR" to a directory containing one of the above files. If "OpenCV"
provides a separate development package or SDK, be sure it has been
installed.

CMakeList.txt 的问题
project(DisplayImage)
find_package(OpenCV REQUIRED)
add_executable(DisplayImage DisplayImage)
target_link_libraries(DisplayImage ${OpenCV_LIBS})
cmake_minimum_required(VERSION 2.8)

改为
project(DisplayImage)
set(OpenCV_DIR /usr/local/opencv/release)
add_executable(DisplayImage DisplayImage)
target_link_libraries(DisplayImage ${OpenCV_LIBS})
cmake_minimum_required(VERSION 2.8)