Any way to add USES clause depending on two options without including bsd.port.options.mk?

[Yuri]

I have two port options: GUI NLS.

I would like to have USES=gettext only when both GUI and NLS are "on".

If it was only one option, say NLS, NLS_USES=gettext would work.

But what about the two options case? Is there any magic to do this 
without .include <bsd.port.options.mk> ?


Yuri