use of %verifyscript

To: Discussion of RPM packaging standards and practices for Fedora <packaging@xxxxxxxxxxxxxxxxxxxxxxx>
Subject: use of %verifyscript
From: Kamal Ahmed <kamal2222ahmed@xxxxxxxxx>
Date: Mon, 7 May 2012 08:13:33 -0700 (PDT)
Delivered-to: packaging@xxxxxxxxxxxxxxxxxxxxxxx
In-reply-to: <4FA3B3C6.5050200@fedoraproject.org>
References: <4FA3B3C6.5050200@fedoraproject.org>
Reply-to: Kamal Ahmed <kamal2222ahmed@xxxxxxxxx>, Discussion of RPM packaging standards and practices for Fedora <packaging@xxxxxxxxxxxxxxxxxxxxxxx>

Is there a way to verify if an application is installed , from within a SPEC file ?
Maybe using %verifyscript section ?

Thanks,
-Kamal.

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References:
- Reusing the same git module for different compat versions?
  - From: Michel Alexandre Salim