For more info...
On my MacOSX 10.15.6 Catalina, I have just installed Tex Live 2020,
and updated to cmake-3.18.2 and doxygen-1.8.20 by using
brew cask install mactex ; brew install cmake ; brew install doxygen
I have commented out the PERL_PATH and MCSGEN_PATH lines in
the Doxygen.in file, as well as the lines:
INPUT += @FLTK_SOURCE_DIR@/FL
INPUT += @FLTK_SOURCE_DIR@/cairo
INPUT += @FLTK_SOURCE_DIR@/src
and I can successfully make a reduced fltk.pdf file, so it's not that there
is something inherently wrong with doxygen > 1.8.15 as such, BUT...
If I include the three INPUT lines above, I can see from the make output
that there are warnings/errors relating to \deprecated in FL/Fl_Menu_Item.H
and then the build/documentation/latex/refman.log concludes with an error
message about "! TeX capacity exceeded, sorry [input stack size = 5000]"
but searching the web suggests this is the result of an incomplete macro
call somewhere in the input which leads to runaway recursion internally.
It's been at least 10 years since I last made an attempt at writing LaTeX,
and I remember that many error messages are obscure, and it's often the
case that I needed to remove input to home in on the real error site...
Hope this helps, but it's time for bed now, might continue at the weekend
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