Netview 7.1 Install

[Judy Stobby <jstobby@co.el-dorado.ca.us>]

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Hi,
I received this error when trying to upgrade from 6.02 to 7.1.

A prerequisite package is missing.  Please install X11.vfb before
installing Tivoli Netview.

I search for this on the tivoli web site, but did not get any hits.
Does anyone know what this is and where I can find it?

Thanks

jstobby.vcf
Description: Card for Judy Stobby