Camera rotation using mathgl

[Some-Punk]

How do I rotate the camera matrix produced by mgl32.LookAtV?  My math is very rusty about these things.

Currently translation on the xz plane is just fine:

 world.Camera = mgl32.LookAtV(mgl32.Vec{10,0,0}, mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 0, 1}
 ...
 world.ShiftX += dX * dTime
 world.ShiftZ += dZ * dTime
 world.Camera = mgl32.Translate3D(float32(world.ShiftX), 0, float32(world.ShiftZ)).Mul4(world.Camera)

I just would like to know how to rotate the Camera post translation.