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Now yes!!!!
Perfect readability. Thank you so much.

P.S.
I managed to resolve my library issues and can compile again.

In case it is useful to someone else, I comment:

1_
Debian 11 is not a friend of Qt6, it prefers Qt5.
Solution:
I uninstalled the Qt6 development libraries and completed the Qt5 ones.

2_
In an oversight when updating, lv2-dev was reinstalled from kxstudio. As I have commented on several occasions, the version of lv2-dev in that repository does not work well.
Solution:
Uninstall lv2-dev. Deactivate kxstudio repositories. Reinstall lv2-dev.
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I'm crossing my fingers. It seems that I finally have my music studio completely to my liking and at full capacity.