When building dhcp_client, it appears that including linux/if_arp.h requires sys/socket.h for the sockaddr definition (at least on my system). I fixed the same issue with ell/net.c but never build dhcp_client. Below is one of the errors I saw when building: In file included from /usr/include/linux/netdevice.h:28, from /usr/include/linux/if_arp.h:26, from examples/dhcp-client.c:31: /usr/include/linux/if.h:234:19: error: field ‘ifru_addr’ has incomplete type struct sockaddr ifru_addr; --- examples/dhcp-client.c | 1 + 1 file changed, 1 insertion(+) diff --git a/examples/dhcp-client.c b/examples/dhcp-client.c index 550b82b..084f6aa 100644 --- a/examples/dhcp-client.c +++ b/examples/dhcp-client.c @@ -28,6 +28,7 @@ #include <unistd.h> #include <stdlib.h> #include <assert.h> +#include <sys/socket.h> #include <linux/if_arp.h> #include <ell/ell.h> -- 2.7.4