Howto rebuild a platform?

[Matwey V. Kornilov]

Hello,

I would like to build my own platform based on existing Kde platform.
For some development and testing purposes, I need Qt framework
configured to use OpenGL ES (instead of OpenGL, how it usually happens
on x86_64).
Unfortunately, I have not found specific tutorial how to build my own
custom platform with FlatPak.

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With best regards,
Matwey V. Kornilov