未定义的引用，将yaml-cpp程序与mingw-w64 + cmake联系在一起。

I'm using mingw-w64 (4.8.0) + cmake to build shared libraries for yaml-cpp (0.5.1). The project has a few build targets in the CMakeLists.txt that comes with it: the main library I'm using mingw-w64 (4.8.0) + cmake to build sh