CMake找不到库（如opencv）的解决办法

一、问题详情
在ubuntu中使用CMake编译链接opencv库的程序时FIND_PACKAGE(OpenCV REQUIRED)报错，找不到opencv，信息如下：

 Found OpenCV Windows Pack but it has no binaries compatible with your
  configuration.
 
  You should manually point CMake variable OpenCV_DIR to your build of OpenCV
  library.
Call Stack (most recent call first):
  CMakeLists.txt:4 (find_package)
 
CMake Error at CMakeLists.txt:4 (find_package):
  Found package configuration file:
 
    /home/wj/opencv/cmake/OpenCVConfig.cmake
 
  but it set OpenCV_FOUND to FALSE so package "OpenCV" is considered to be
  NOT FOUND.
 
-- Configuring incomplete, errors occurred! 

二、解决方法
经过查阅资料病各种尝试，现已解决。主要问题在于库路径问题，应该在CMakeLists.txx中设置opencv路径指向build文件夹。

set（OpenCV_DIR  /path/to/opencv/build）
find_package(OpenCV REQUIRED)

这样才能正确的找到opencv库。