Octave 5.1.0 and Qt installation problems

[babelproofreader]

On trying to install the latest Octave 5.1.0 I'm getting this configuration
error:

configure: WARNING: Qt does not work with the OpenGL libs (GL and GLU);
disabling OpenGL graphics with Qt GUI

I am already running an older version of Octave 4.2.1 with no problems and
it doesn't matter whether I set the configure flag to --with-qt=4 or
--with-qt=5, both give the same error. How do I solve this?





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