I think there are two separate issues at play here.
One is with longtabu X.
Replacing X columns with c columns:
https://salsa.debian.org/paolog-guest/doxygen/blob/master/debian/patches/longtabu.diff
I got past the "! Missing } inserted." errors that I originally reported.
Unfortunately this breaks something else, as shown by the attached stripped-down example.
This command:
/usr/bin/pdflatex -shell-escape doxygen_manual.tex
fails with both texlive-base 2018.20181214-1 and 2018.20190126-1.
It returns 1 and prints this error in doxygen_manual.log:
! LaTeX Error: Something's wrong--perhaps a missing \item.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.70 \end{longtabu}
It goes away if I remove these lines towards the end of tables.tex:
-\begin{DoxyItemize}
-\item Item 1
-\item Item 2
-\end{DoxyItemize}\\\cline{1-3}
but this is not viable because similar code occurs in a lot of places in doxygen-generated tex files.
Any help is appreciated so that we can work around these latex issues for the doxygen 1.8.15 release while upstream fixes tabu.
Paolo
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