[ESS] make problems with latest git [SOLVEDish]

[Boylan, Ross]

Thank you, Lionel and Rodney.  That did the trick: the whole thing built, including the documents.

Will everything actually work properly without xref?  I assume xref was required because something uses it.

I even got a build in the original directory after doing a make clean.

There are still lots of warnings....

And I assume it still won't build in a shell in emacs.

But now I can return to my original problem (not yet posted).

Ross
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