Comment 59 for bug 2023322

(In reply to Michael Catanzaro from comment #48)

> After discussing this with Benjamin, it looks like this is actually required
> by GTK 4, not by WebKit. Are you able to run any other GTK 4 applications?

I am using an older distro and don't believe I have anything GTK4 already, so I installed gnome-calculator flatpak from gnome-nightly to test, and indeed it fails with the same error.

$ flatpak run org.gnome.Calculator.Devel
No provider of glGenSamplers found. Requires one of:
    Desktop OpenGL 3.3
    GL_ARB_sampler_objects
    OpenGL ES 3.0
$