Defines for detecting build OS?

[Matthew Pounsett]

Hi there.  My apologies if this is something that's covered in  
documentation somewhere... but, due to the inability to google for  
punctuation, I'm finding it a bit hard to locate the appropriate  
docs.  I've done what I think is a reasonable amount of manual  
searching of documentation without coming up with anything.

I often see spec files that reference defines which appear to be set  
by the OS... for example, phrases like "%if 0%{?rhel}".  Where are  
these defined?  I can't find references in the files in /usr/lib/rpm/  
or /etc/rpm/, and can't see a list of these defines in the available  
documentation.

Is there a relatively complete list of these defines somewhere?  Is  
there a config file in each RPM-using OS where a local one is  
defined?  Pointers would be quite welcome.

Thanks!
    Matt


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