proper way to handle ports dependencies ?

[Luigi Rizzo]

I have some ports (linux-gspca-kmod, linux-ov511-kmod, more in the
future) which depend on linux-kmod-devel which in turn only works
on i386 and 6.2 or above.

Is it enough to put ONLY_FOR_ARCHS and .if ${OSVERSION} < ...
just in the parent (linux-kmod-devel), or should i
put it in all children too ?

	cheers
	luigi