--- otp_src_R12B-5/erts/emulator/drivers/common/inet_drv.c	Tue Nov  4 11:51:25 2008
+++ otp_src_R12B-5-patch/erts/emulator/drivers/common/inet_drv.c	Mon Jun 20 11:02:49 2011
@@ -4128,6 +4128,7 @@
 	    break;
 
 	case INET_IFOPT_HWADDR: {
+#ifdef IFHWADDRLEN
 #ifdef SIOCGIFHWADDR
 	    if (ioctl(desc->s, SIOCGIFHWADDR, (char *)&ifreq) < 0)
 		break;
@@ -4137,6 +4138,7 @@
 	    sys_memcpy(sptr, (char*)(&ifreq.ifr_hwaddr.sa_data), IFHWADDRLEN);
 	    sptr += IFHWADDRLEN;
 #endif
+#endif
 	    break;
 	}