how to export a modified kernel header

Question

I modified some files in the Linux kernel

include/linux/tcp.h
include/net/tcp.h 
net/ipv4/sysctl_net_ipv4.c
net/ipv4/tcp_output.c

Following

Answer 1

A. Copy them to somewhere the code expects to find them, such as a directory you then pass to the compiler via -I, and then make sure that the code actually includes them.