How to add USES only for some ARCH?

[Yuri]

I need to add USES=fortran only for some architectures.


This doesn't work, because bsd.port.pre.mk applies USES:


.include <bsd.port.pre.mk>
.if ${ARCH} != "amd64"
USES+=          fortran
.endif


What is the correct way of doing this?


Thank you,

Yuri