building GMT5 documentation

Hi,

I'm having problems building the documentation for GMT5 in Debian sid.
I've followed the building instructions from the Wiki, and although the
programs build OK, the documentation fails when working on example 23.
It's very difficult to debug, given tha the only message I get is that
there's an unrecoverable error:

╭─────
│ $ make docs_man
│ [  7%] Built target _docs_examples_verbatim
│ [  7%] Copying doc/rst/source ...
│ [  7%] Built target _docs_copy_rst_tree_source
│ [  7%] Copying doc/rst/themes ...
│ [  7%] Built target _docs_copy_rst_tree_themes
│ [ 10%] Built target _docs_copy_fig
│ [ 11%] Built target gen_gmt_headers
│ [ 13%] Built target pslib
│ [ 34%] Built target gmtlib
│ [ 35%] Built target gmt
│ [ 35%] Built target gmt_for_img_convert
│ [ 35%] Generating ../rst/_source/_images/GMT_coverlogo.pdf
│ [ 36%] Generating ../rst/_source/_images/GMT_RGBchart_a4.pdf
│ [ 36%] Generating ../rst/_source/_images/GMT_RGBchart_letter.pdf
│ [ 36%] Generating ../rst/_source/_images/GMT_RGBchart_tabloid.pdf
│ [ 71%] Built target _docs_scripts_fig
│ [ 82%] Built target _docs_scripts_verbatim
│ [ 82%] Generating ../rst/_source/_images/example_23.pdf
│ Unrecoverable error: limitcheck in ]
│ Operand stack:
│     PSL_path_x  --nostringval--  3452  3457  3460  ...
│ ps2raster: System call [gs -q -dSAFER -dNOPAUSE -dBATCH -sDEVICE=bbox -sFONTPATH=/usr/local/lib/GMT/GMTdev/gmt5/doc/examples/ex31/fonts -dMaxBitmap=2147483647 -dUseFastColor=true /usr/local/lib/GMT/GMTdev/gmt5/doc/examples/ex23//example_23.ps 2> /usr/local/lib/GMT/GMTdev/gmt5/build/doc/rst/_source/_images/ps2raster_13933c.bb] returned error 65280.
│ doc/examples/CMakeFiles/_docs_examples_fig.dir/build.make:172: recipe for target 'doc/rst/_source/_images/example_23.pdf' failed
│ make[3]: *** [doc/rst/_source/_images/example_23.pdf] Error 1
│ CMakeFiles/Makefile2:1667: recipe for target 'doc/examples/CMakeFiles/_docs_examples_fig.dir/all' failed
│ make[2]: *** [doc/examples/CMakeFiles/_docs_examples_fig.dir/all] Error 2
│ CMakeFiles/Makefile2:1273: recipe for target 'doc/rst/CMakeFiles/docs_man.dir/rule' failed
│ make[1]: *** [doc/rst/CMakeFiles/docs_man.dir/rule] Error 2
│ Makefile:518: recipe for target 'docs_man' failed
│ make: *** [docs_man] Error 2
╰─────

The list of numbers in "..." is *very* long.  If I try to view the
example_23.ps file with ghostscript, I get a partial image of example 23
in *.pdf online (the map without the contours, lines, etc.), followed by
error messages from ghostscript matching the one shown during building).

I realize this is likely a problem with ghostscript in Debian, given
that I haven't found any reference to this issue elsewhere.  Is anybody
else seeing this?  I could avoid this by just installing the pre-built
documentation, but unfortunately it doesn't include the man pages in man
format, which I use frequently and extensively in Emacs.

Cheers,

-- 
Seb

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