On ons, 2011-03-02 at 13:15 -0800, David E. Wheeler wrote:
> If not, how should one require a PL? Come to think of it, how might I
> require other features that might not be included in a particular
> build, like xpath()?
Probably not within the extension mechanism. An RPM package cannot, for
example, require kernel features either, even though that is
occasionally an actual requirement of some package. Moreover, declaring
such a dependency wouldn't actually help making the dependency
available, because you cannot just install the dependency, you need to
rebuild the (OS/DBMS) kernel.