USE_QT_VER after including bsd.port.pre.mk?

[Volker Stolz]

For one of my ports, portlint now complaints:
FATAL: Makefile [61]: USE_QT_VER is set after including bsd.port.pre.mk.

I'm really at a loss on how to fix this, since USE_QT_VER depends on
OPTIONS in my case. Is there something like an approved workaround?
E.g. splitting this in master/slave(s)?

Volker
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