why do source rpms have "prep" dependencies?

[Peter Gordon]

On Sun, 2007-09-09 at 10:04 -0400, Sam Varshavchik wrote:
> %prep, %build, and %install are ordinary shell scripts. So, when asked to 
> run through a portion of the build cycle, the only thing that's known are 
> the dependencies for the entire build cycle, so rpm enforces that.

Well, we can already include seperate %preun, %postun, %pre, and %post
dependencies using Requires(preun):, Requires(postun), et al.; can we do
something similar for %prep, %build, and %install?

Thanks.	
-- 
Peter Gordon (codergeek42)
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