default or selected kernelversion does not have config value CONFIG_WIMAX_GDM72XX_QOS.
Result is shown for kernelversion 6.5.1

Enable QoS support

configname: CONFIG_WIMAX_GDM72XX_QOS

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>GCT GDM72xx WiMAX support
└─>Enable QoS support
In linux kernel since version 3.1 (release Date: 2011-10-24)