OpenGL ES3 笔记--编译安装时报错DPVR_WINDOW_SYSTEM解决

使用cmake编译安装OpenGL ES3时，会报错

CMake Warning at framework/PVRShell/CMakeLists.txt:177 (message):
 PVR_WINDOW_SYSTEM (Window System) Variable has been not set for PVRShell
    Supported windowing systems can be enabled by passing :
    -DPVR_WINDOW_SYSTEM=NullWS, -DPVR_WINDOW_SYSTEM=X11,
    -DPVR_WINDOW_SYSTEM=XCB,  -DPVR_WINDOW_SYSTEM=Wayland,
    -DPVR_WINDOW_SYSTEM=Screen to Cmake,

意思是我们没有设置window变量。由于我们使用的是X11 window system，所以在使用cmake时输入

cmake ../CMakeLists.txt   -DPVR_WINDOW_SYSTEM=X11