I don't know why but commented the preprocess macro out seems to fix it
```patch
diff --git a/src/network/layer2.c b/src/network/layer2.c
index f6703ed..d220862 100644
--- a/src/network/layer2.c
+++ b/src/network/layer2.c
@@ -29,7 +29,7 @@
 /*
  * Freebsd and Cygwin doesn't define 'ethhdr'
  */
-#if defined(__FreeBSD__) || defined(__CYGWIN__)
+/* #if defined(__FreeBSD__) || defined(__CYGWIN__) */
 
 #define ETH_ALEN	6			/* Octets in one ethernet addr	 */
 #define ETH_P_IP	0x0800		/* Internet Protocol packet	*/
@@ -41,7 +41,7 @@ struct ethhdr {
 	unsigned char   h_source[ETH_ALEN];
 	u_int16_t       h_proto;
 } __attribute__((packed));
-#endif
+/* #endif */
 
 #include <pcap.h>                 /* for DLT_IEEE802_11_RADIO, DLT_IEEE802_11 */
```