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

The right location of INSTALL_HDR_PATH should be /usr instead:

$ make headers_install INSTALL_HDR_PATH=/usr