building rpm from zip file

[Zippy Zeppoli]

Hi List,
I was wondering, is there a way to take a zip file that just needs to be
extracted to a given directory and build the rpm based off the zip file
without creating a spec file?

I saw in some documentation the use of a command as follows:

rpmbuild -tb somezip.zip

I looked in the man page but didn't see a description for -tb. Is this a
valid usage?

Thanks,
Z
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