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"What satisfies this dependancy?"

Here's a simple question, I'm sure:

We all know how packages can provide meta-virtual-package-dependancy
thingies, e.g., the mailx package requires a mail-transport-agent package,
and a bunch of packages all provide mail-transport-agent, so take your pick.

How do I discover what installed package is currently providing/satisfying
one of those kinds of dependancies?  Continuing the above example,
how do I find out which of the many possible packages is providing
mail-transport-agent on an installed system?

(The actual problems at hand are with libraries, but the solution should
be the same, or similar enough.)


I would therefore like to posit that computing's central challenge, viz. "How
not to make a mess of it," has /not/ been met.
                                                 - Edsger Dijkstra, 1930-2002

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