This problem has been seen before in Qt4, where Debian briefly tried
using GLES2 on arm* with 4.7.3 then changed back, but Ubuntu kept using
it, failed build example:
https://launchpad.net/ubuntu/+source/openscenegraph/3.2.0~rc1-4/+build/5615979
The changelogs note that GLES was used, but not why.
In Qt4, changing between GL and GLES breaks ABI (#632602); I don't know
if this is also the case in Qt5 (which would require a libqt5opengl5 ->
libqt5opengl5a transition).
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