diff -up nvidia-settings-450.66/src/libXNVCtrlAttributes/NvCtrlAttributesVidMode.c.proto nvidia-settings-450.66/src/libXNVCtrlAttributes/NvCtrlAttributesVidMode.c --- nvidia-settings-450.66/src/libXNVCtrlAttributes/NvCtrlAttributesVidMode.c.proto 2020-08-12 22:00:30.000000000 +0200 +++ nvidia-settings-450.66/src/libXNVCtrlAttributes/NvCtrlAttributesVidMode.c 2020-09-21 22:37:45.334140836 +0200 @@ -24,6 +24,9 @@ #include "msg.h" #include <X11/extensions/xf86vmode.h> +#ifndef X_XF86VidModeGetGammaRampSize +#include <X11/extensions/xf86vmproto.h> +#endif #include <stdlib.h> #include <string.h>