For example, on my openSuSE box ghostscript aborts with
Error: /undefinedfilename in --file--
Operand stack:
(/home/gub/NewGub/gub/target/linux-x86/.../otf/emmentaler-20.otf)
(r)
^^^^^^^^^^^^^^^^
[...]
Last OS error: No such file or directory
Yep. It is a known limitation that you have to be the user gub and
that the gub git repository must be the subdirectory gub in
~/gub/NewGub.
Ha, `known limitation'! Known to whom? A subdirectory called
`NewGub' was mentioned last in a thread 2½ years ago on
lilypond-devel, and it is completely undocumented otherwise.