RPM boolean dependencies in Requires

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I have a package which needs GNU Privacy Guard (GPG) at runtime.  It
can either run gpg (v1) or gpg2, as it uses a subset of the features
supported by both, and the program searches for both binaries.

The natural way to express this as an RPM dependency would be:

  Requires:     (gnupg or gnupg2)

Unfortunately this is forbidden by the packaging rules:

  https://fedoraproject.org/wiki/Packaging:Guidelines#Rich.2FBoolean_dependencies

(BTW the link in that section is wrong - it should go to:
http://rpm.org/user_doc/boolean_dependencies.html )

This admonition was added in:

  https://fedoraproject.org/w/index.php?title=Packaging:Guidelines&diff=prev&oldid=441810

What's not explained is why, except that it "causes issues with the
package updates process".  It seems as if the or-rule above would be
simple enough, so what's the exact problem?

Rich.

-- 
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