Compile Failed 3.6

I tried to compile 3.6,but on step No.264 failed,Tips: “libretro/libretro-common/libco/libco.o” ,how to fix and continue?Help please thanks!

Too little information, please post the build log

this is my build infomation.

My Operator System is Ubuntu18.04,This is my second time to complie(I excuted make clean)

Do you really need atari800 core? If not, you can remove the option to compile atari800 and compile again.
It’s the easiest way to solve the error.

I‘ll try ,thank you a lot.