[CentOS] rpmbuild question.

I am attempting to build from a src.rpm (knowing very little about rpm at all) and the spec file notes that the architecture should be set on the command line:

# platform defines - set one below or define the build_xxx on the

command line

Now. My question is this, how does one do this using rpmbuild? The syntax rpmbuild --target centos4 package.src.rpm seemingly has no effect.

Please note that I am a digest subscriber so it is most useful if replies are sent to me directly as well as to the list.

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