Comment # 7 on bug 75602 from Michel Dänzer

(In reply to comment #0)
> It seems that Mesa is using the compatability context which is limited to
> OpenGL 3.0.

It's up to the application to choose a compatibility or core context. Mesa
never has and probably never will support higher than 3.0 with compatibility
contexts. You'd probably have to ask the Unigine developers why it wants to use
a compatibility conext with GL_ARB_geometry_shader4 in this configuration.