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|Maximum RPM: Taking the Red Hat Package Manager to the Limit|
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While creating subpackages changes the general structure of the spec file, there's one section that doesn't change: the build-time scripts. This means there is only one set of %prep, %build, and %install scripts in any spec file.
Of course, even if RPM doesn't require any changes to these scripts, you still might need to make some subpackage-related changes to them. Normally these changes are related to doing whatever is required to get the all the software unpacked, built, and installed. For example, if packaging client/server software, the software for both the client and the server must be unpacked, and then both the client and server binaries must be built and installed.
As you can see, the build-time scripts are about as simple as they can be. 
This is the advantage to making up an example. A more real-world spec file would undoubtedly have more interesting scripts.