qt6-only in poudriere. Is it possible?

From: void <void_at_f-m.fm>
Date: Mon, 22 Dec 2025 14:28:47 UTC
Hi,

Is there a way (yet) to have qt6- *only* for qt- flavoured ports?
If there is a qt5-flavour, I don't want it built at all. I'm using 
poudriere. Am building on 15-stable and -current.
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