opencv在Linux安装出现“The CXX compiler identification is unknown”问题

按照参考文档键入如下命令：

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..

如果出现如下这种问题：

-- The CXX compiler identification is unknown
-- Check for working CXX compiler: /home/gnu/bin/c++
-- Check for working CXX compiler: /home/gnu/bin/c++ -- broken
CMake Error at /home/<user>/share/cmake-2.8/Modules/CMakeTestCXXCompiler.cmake:45 (MESSAGE):
  The C++ compiler "/home/gnu/bin/c++" is not able to compile a simple test

可以考虑键入命令：前提是

/usr/bin/c++ 存在

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_CXX_COMPILER=/usr/bin/c++ -D CMAKE_INSTALL_PREFIX=/usr/local ..

可参考： 

http://stackoverflow.com/questions/9699930/cmake-complains-the-cxx-compiler-identification-is-unknown

http://docs.opencv.org/2.4/doc/tutorials/introduction/linux_install/linux_install.html#linux-installation