Hi All!
I am using a custom board having nrf52833/20+nrf21540 to extend the range. I am using the nrf5 SDK 17.0.1 "Radio test" example to do my job.
The issue is that I have added the nrf21540.h in the include directory of segger embedded studio and also added the source files from that folder into my project "radio test". But still, I am getting the errors as shown in the image.

Source Files are added and errors are shown in the image. Header file i already included.
Thanks in advance for the help!