When I try to start example on Raspberry Pi with eglfs platform I get:

pi@raspberrypi:~ $ ./qopenglwidget  
MESA-LOADER: failed to retrieve device information
MESA-LOADER: failed to retrieve device information
MESA-LOADER: failed to retrieve device information
Setting framebuffer size is only available with DRM atomic API
Failed to move cursor on screen HDMI1: -13
No usable crtc/encoder pair for connector "Composite1"
Could not set cursor on screen HDMI1: -13
Could not set cursor on screen HDMI1: -13
Could not set cursor on screen HDMI1: -13
Could not set DRM mode for screen HDMI1 (Permission denied)
Could not queue DRM page flip on screen HDMI1 (Permission denied)
..... (Endless lines "Could not queue DRM page flip on screen HDMI1 (Permission denied)") ....