how to fix this error

[wolfyy59]

i am using raspberry pi zero w 2 sshed in a raspios_armhf-2021-11-08/2021-10-30-raspios-bullseye-armhf
i followed all insctructions i got this error

BUILDING DRIVER for kernel 5.10 brcmfmac_5.10.y-nexmon/brcmfmac.ko (details: log/driver.log)
make[1]: *** No targets specified and no makefile found. Stop.
make: *** [Makefile:50: brcmfmac.ko] Error 2
root@raspberrypi://root/nexmon/patches/bcm43436b0/9_88_4_65/nexmon#

any fix?