> Re: Naive question: boolean dependency
 > From: Michael Jennings <mej kainx org>
 > To: rpm-list redhat com
 > Subject: Re: Naive question: boolean dependency
 > Date: Thu, 21 Feb 2008 09:31:11 -0800
 > On Thursday, 21 February 2008, at 16:29:09 (+0100),
 > Vladimir Mihai Pacuraru wrote:
 >
 > > > Please share some.  I would love to see them.
 > >
 > > Same interest here!
 >
 > I could be wrong, but you may have missed the subtlety. :)
 >
 > Put more bluntly:  "Had you actually grep'd for them yourself, you
 > wouldn't have found any because they don't exist.  RPM can't do that."

So basically you can't do boolean dependencies, right? I mean what I 
need to do is to say install package X if version Y or Z is already 
installed.

 > > Again, I would like to do pretty much the same thing (say that a
 > package requires either a version or another) and tried to adapt the
 > above Requires: example but instead got this error:
 >
 > error: line 17: Dependency tokens must begin with alpha-numeric, '_'
 > or '/':

Because you can't do that either.

 > What exactly are the uses for the underscore and the / characters?
 >
 > Underscores are generally considered "word" characters for historical
 > programmer reasons.  / allows file dependencies.

Thank you very much for your answer, Michael!