Paul Traina 50893e50e2 Bring xditview back from the grave (part 2).
Fix things so it *really* won't compile if the environment isn't there.

This commit has been sitting in my to-do list for 2 months.  Xditview
should never have been half-removed, so now it's back with a vengance
because we want to keep groff intact as a package.
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