Build dependency exceptions

[Patrice Dumas]

> I could live with that. I'd hate to see us having specs like those for 
> SuSE, which seem to list *every* buildreq and *all* of their deps, 
> sometimes amounting to 50+ buildreqs. What a nightmare to maintain if 
> package names changed.
> 
> What I'm trying to avoid is things like a buildreq of perl for a perl 
> module package being a blocker.

That's also my aim ;-).

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Pat