How to install ft-multi-if kernel

[tagorepothuneedi]

I'm trying to build a multi-channel multi radio based mesh operation. I learned this kernel branch might do that exactly . I'm new to linux and I was trying "https://www.linux.com/topic/desktop/how-compile-linux-kernel-0/ " instructions to install but getting errors like cc1: error: code model kernel does not support PIC mode

I also want to know if this version of kernel supports mac80211_hwsim module

Thanks in advanced