GLSL shader compiler error on older cards?

Hi all, I have an older GPU and I often get shader compiler errors when trying to use GLSL rendering in the viewport. Are there unsupported shader compute models or something that I can look into? I remember it used to work at one time, but really doesn’t seem to any more.

I compile my own builds of Blender so I can modify deps or source if I need to change something and recompile to support my older card.

Maybe solved(?). I realized I don’t get errors all the time, so I’ll have to track down what throws an error.