--- ./ifconfig.c 2017-02-21 23:54:32.000000000 +0530 +++ ../ifconfig.c 2017-04-09 14:12:07.253003297 +0530 @@ -44,6 +44,7 @@ #include <string.h> #include <unistd.h> #include <netdb.h> +#include <arpa/inet.h> /* Ugh. But libc5 doesn't provide POSIX types. */ #include <asm/types.h>