Is it possible to dynamize "requires" at RPM build time?

[Kai Engert]

A "Requires:" entry in a SPEC file may define the smallest library 
version acceptable for the resulting RPM package.

Is it possible by some SPEC logic, to make a "Requires:" entry dynamic?

In other words, is it possible, at RPM build time, to query the 
installed library release in the build environment, and have the 
produced RPM be dependent on >= that library version?

Thanks in advance,
Kai

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