make fail

[Allenhanbo]

Hi, I am doing project about crazyflie autonomous flying recently and I found this respositories.

I was trying to git clone the firmware and flash to my cf2, but when I was trying to complie the firmware by typing the command: make PLATFORM=cf2, it shows:

make PLATFORM=cf2
CLEAN_VERSION
CC tasks.o
/tmp/ccPEzKq0.s: Assembler messages:
/tmp/ccPEzKq0.s:2201: Error: selected processor does not support `clz r4,r4' in ARM mode
tools/make/targets.mk:26: recipe for target 'tasks.o' failed
make: *** [tasks.o] Error 1

Could you help me figure this out problem?