ReSpeaker Core v2.0 Kernel compile

Hello,

I bought ReSpeaker Core v2.0 for audio proejcts.

I just want to modify kernel code to use USB AUDIO ?

I dowload the GitHub - respeaker/rk-linux-develop: respeaker v2 source code
but I get a trouble


the u-boot is compile safely accomplished,but kernel compile is stop like that. picture (I’m using centos 7 )
What should I fix it.
Thanks,