The built-in WIFI module doesn't switch to monitor mode. This makes me looking for rebuilding the module from the Git repository:   I am stuck with the following error: *** No rule to make target 'arch/arm/tools/gen-mach-types', needed by 'include/generated/mach-types.h'. What is necessary to rebuild and replace the module with a new one?   Here is what was done so far: root@orangepiplus:/usr/src/rtl818