Use of %{INSTALLPREFIX} in %post section

[arun sharma escalate com]

Hi,

I have a relocatable package with a default prefix, which could be
overridden at install time.
After the package installation, I'd like to execute a command on one of the
installed files 
using the %post macro.

But without having access to %{INSTALLPREFIX}, I can't find the installed
files. I've examined
the environment of the shell that's invoked for %post and I didn't find
anything that had the
install directory.

So my question is, how do I locate the installed files in %post for a
relocatable package ?

	-Arun