How can I change some values within the spec file during rpmbuild?

[barry@xxxxxxxxxxxxxxxxxxx]

All,

How can I change something within the spec file while building the 
rpm package using rpmbuild command?

For example, if I have a build number that I need to reflect it in 
the "release:" field, then can I say something like:

%define buildnumber 111
...
Release: %{buildnumber}

and when execute rpmbuild, then I type "rpmbuild -bb specfile --
define 'buildnumber 222'  ???

Please comment and correct my syntax.

Thanks.

BArry





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