[Octave-bug-tracker] [bug #50129] Incorrect Qt version chosen after automatic updates to configure

[Mike Miller]

Follow-up Comment #2, bug #50129 (project octave):

I don't think caching the variables will help in this case, since saving the
cache to a file is always optional, but declaring them as AC_ARG_VAR would
force them to be saved in the command line arguments passed to configure when
it is re-run. It's probably the caching of something else that is causing the
appropriate test to be bypassed so that the right options are not calculated.
I would take a look at what commands are used to determine whether the -qt4 or
-qt5 options are needed, and whether they are bypassed in some cases while the
options themselves are not saved.

This isn't a problem on my system because Qt 5 is the default, but maybe
forcing a Qt 4 build would trigger this for me.

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