how to generate version and release numbers in spec files dynamically?

[Fulko Hew <fulko.hew@xxxxxxxxx>]

At the top of spec files we have entries for version and release information like:

Version:    1.0
Release:    5

I'd like this information to be auto-retrieved from values in files in the build/source

directories, so that my 'make' process can bump the release number every time
there was a build, without me having to go in and edit the spec file every time.

sort of the equivalent of:

Release: %{<file_containing_release_number}

Is this possible?  how?

TIA
Fulko

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