[LyX/2.3.x] Qt4 compilable again

[Scott Kostyshak]

On Fri, Nov 25, 2022 at 12:17:03AM +0100, Jean-Marc Lasgouttes wrote:
> Le 24/11/2022 à 17:21, José Matos a écrit :
> > Probably here it does not mater but in general the safer version would
> > be to move the parenthesis from right to let, i.e.
> > 
> >   (degree) * M_PI/180
> > 
> > I am thinking about examples like qDegreesToRadians(a+b)
> 
> I did that on master. Note that I have doubts that we want to support Qt
> 5.0.x. What would be a good first usable version ? Versions history suggest
> that Qt5.3 or 5.4 would be contemporary with gcc 4.9, our oldest supported
> compiler.
> 
> I read at some time that Qt 5.6 is the first really good version (and LTS),
> but this is 2016-era.

I think one of the reasons we began suggesting Qt 5.6 (instead of 5.5)
was the following bug:

  https://www.lyx.org/trac/ticket/9731

That might be Linux-specific though.

> Shall we do something, or just accept all Qt5 versions?

No strong opinion. If no one else has a preference, I would say set Qt
5.6 as minimum. I think CMake already does that:

  set(min_qt5_version "5.6")

Scott
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