* Sébastien Villemot <sebastien@debian.org> [2017-10-17 19:13]:
I recently had to disable the use of xvfb in the octave testsuite,
because it was causing crashes at build time (related to the move to
Qt 5) [1].
I guess that this problem will be eventually fixed and xvfb will work
with Qt5.
Hence I think that simply adding gnuplot-nox as a test dependency
would be a better option (also because it drags less additional
dependencies); but I did not verify that it is enough to fix test
failures, so I may be missing something.
This is probably a better solution, but it has the same drawbacks as
the xvfb solution, as pointed out by Antonio in the other message,
namely that it will add gnuplot-nox dependency to all packages (the
majority of them do not need it) and that it will need an upload of
autodep8 to stretch-backports in order to have the tests working on
ci.d.o.
I will have a try on the solution proposed by Antonio.