FreeRTOS is not available in SPRESENSE

Currently, I am thinking of using the FreeRTOS library to make it multi-threaded with SPRESENSE's Arduino compatible.

However, when I did the verification, the following error occurred and I cannot use it.
I get the same error when I try to run the sample program.

 main:3:10:fatal error:avr/io.h:No such file or directory
3 | # include <avr/io.h>
|          ^~~~~~~~~~
compilation terminated.
exit status1

Can I use the FreeRTOS library with SPRESENSE?
If anyone knows the cause of this error, could you tell me the solution?

Thank you for your cooperation.