use USE_FEATURE_UDHCP_PORT instead of ifdef
diff --git a/networking/udhcp/dhcpc.h b/networking/udhcp/dhcpc.h
index 1ebccd4..04e320c 100644
--- a/networking/udhcp/dhcpc.h
+++ b/networking/udhcp/dhcpc.h
@@ -13,9 +13,7 @@
/* TODO: combine flag fields into single "unsigned opt" */
/* (can be set directly to the result of getopt32) */
char no_default_options; /* Do not include default optins in request */
-#if ENABLE_FEATURE_UDHCP_PORT
- uint16_t port;
-#endif
+ USE_FEATURE_UDHCP_PORT(uint16_t port;)
int ifindex; /* Index number of the interface to use */
uint8_t opt_mask[256 / 8]; /* Bitmask of options to send (-O option) */
const char *interface; /* The name of the interface to use */