printf "#include <linux/types.h>\n" > build_check.c
printf "#include <linux/netfilter_ipv4/ip_queue.h>\n" >> build_check.c
printf "int main() { return 0; }\n" >> build_check.c
printf "#include <linux/types.h>\n" > build_check.c
printf "#include <linux/netfilter_ipv4/ip_queue.h>\n" >> build_check.c
printf "int main() { return 0; }\n" >> build_check.c