•  media-libs
•  x11-base
•  x11-drivers

media-libs

media-libs / mesa : OpenGL-like graphic library for Linux

• Use libglvnd for dispatch.

x11-base

x11-base / xorg-server : X.Org X servers

• Use libglvnd for dispatch.

x11-drivers

x11-drivers / nvidia-drivers : NVIDIA Accelerated Graphics Driver

• Use media-libs/libglvnd for dispatch