[...]
Package natbib Warning: There were undefined citations.
(./gretl-ref.aux (./cmdref.aux) (./funcref.aux) (./operators.aux)
(./comments.aux) (./optarg.aux) (./reftables.aux) (./biblio.aux))
Package rerunfilecheck Warning: File `gretl-ref.out' has changed.
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(rerunfilecheck) or use package `bookmark'.
LaTeX Warning: There were undefined references.
LaTeX Warning: Label(s) may have changed. Rerun to get cross-references right.
)pdfTeX warning (dest): name{func-dolnobs} has been referenced but does not ex
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Output written on gretl-ref.pdf (172 pages, 942022 bytes).
Transcript written on gretl-ref.log.
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make: *** [pdfdocs] Error 2
I'm truly sorry if all of you watching on are frustrated and irritated at having had to read all this crap from the past few days and I truly thank you for all the help and time you've devoted to my issues _pro bono_. I just want a resolution and I think I'm getting there!
I'll now proceed to try Helio's solution, as promised.
Ta,
C