The Broadcom EGL implementation does not work on Pi 4 due to it being a different GPU. This is why Qt's brcm-eglfs platform integration does not work. Try using the mkspec for eglfs-bgm, it might work with fake KMS mode that Pi 4 uses. There is already a mkspec for it:
https://code.qt.io/cgit/qt/qtbase.git/t ... qmake.confThis might not work without the real KMS driver which unfortunately also does not work yet on Pi 4, again due to it using a different GPU.
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