[QGIS-Developer] Master fails to compile on Ubuntu 16.04

[Régis Haubourg]

Hi all, since this morning, compiling master fails on
src/core/qgsrenderchecker.cpp:197:10: error: ‘class QImage’ has no member
named ‘devicePixelRatioF’

I guess this was introduced by
https://github.com/qgis/QGIS/commit/49e8e860293452c5869e01f37c70e1fb3778b660#diff-88ed6cc2d6bc7815dd8b78700d8ecf3a
12 hours ago.

This seems to raise minimum requirement to QT 5.6 when Ubuntu 16.04 only has
5.5.1

Is this something we can mitigate or is that a sudden death for ubuntu
16.04 support?

Regards,
Régis
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