[MacPorts] #70137: gtk4 apparently requires OpenGL 3 to work, which means that everything will be broken if switched to it on older OS

[MacPorts]

#70137: gtk4 apparently requires OpenGL 3 to work, which means that everything will
be broken if switched to it on older OS
--------------------------+-------------------------------
 Reporter:  barracuda156  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.9.3
 Keywords:                |       Port:  gtk4, pavucontrol
--------------------------+-------------------------------
 Installed an update to `pavucontrol` now, and it fails to run:
 {{{
 No provider of glGenSamplers found.  Requires one of:
     Desktop OpenGL 3.3
     GL_ARB_sampler_objects
     OpenGL ES 3.0
 zsh: abort      pavucontrol
 }}}

 GTK3 version launched normally.

 Is it possible to fix GTK4? If not, then it should be handled like with
 Qt4/Qt5, pegging unsupported systems to GTK3.

-- 
Ticket URL: <https://trac.macports.org/ticket/70137>
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