Build gcc 5 from gcc 10

I need gcc5 to build linux kernel version 4.0.

Some issue occurs while build gcc5, here’s website to solve these issues.

https://unix.stackexchange.com/questions/335717/how-to-handle-error-compiling-gcc-4-7-0-using-gcc-6-2-1
note,

• You have to edit both cfns.gperf and cfns.h . – ulatekh Apr 27 ‘20 at 13:22

https://unix.stackexchange.com/questions/335717/how-to-handle-error-compiling-gcc-4-7-0-using-gcc-6-2-1

Glibc version high also failed, sys/ustat.h: No such file or directory.