[CentOS] Recompiling source rpms for i386, i686 and x86_64 on the same box?

At the risk of sounding like an newbie, is is possible to build the RPMS 
for all architectures on the same box at the same time? I would really 
like to automate this, so that I can keep track of the RPMS's and build 
them into my own future repo. (That's another project, I'm sure I'll 
come to the list for that one!)

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