@jsulm
http://download.qt.io/official_releases/qt/5.12/5.12.8/single/qt-everywhere-src-5.12.8.tar.xz

i downloaded it form here and followed this steps https://www.tal.org/tutorials/building-qt-512-raspberry-pi

according to that i can say that 3rd party content also built along with the code

Solved: Now I use wayland-egl and everything is fine.

The Long Story to Get the Simple Solution:
At first, I used raspberrypi-userland for OpenGL ES. However, it didn't work.

I tried VC4 DRM driver in the next. I have struggled to get it work, and I opened an issue on the repository. Then anholt, the author of the driver,
updated the Wiki. By following the Wiki, I finally succeeded in getting it work.

mesa3d is necessary to provide OpenGL ES API, so I installed it with drm backend. However, it didn't work since eglCreatePbufferSurface is stubbed in the backend. So I had to use other QPA.

Next, I tried X11 since Buildroot supports xcb backend, but neither did it work. I thought porting Wayland should be much easier than fixing the issue, and actually it is.

There is some additional information on this issue in the JIRA at https://bugreports.qt.io/browse/QTBUG-45122