Win7+Qt5.9.3-msvc2015，How open and use webgl modules?

Hello!I used qt5.9.3-msvc2015 and compiled the source code, but still did not open the webgl module;What exactly should I do to turn on webgl functionality?Ask you to help me!

Sorry to bother you again, but after I compile many Qt source code, I still can't open the webgl module, I really hope you can give me an accurate answer!