diff --git a/bacnet-stack/include/ethernet.h b/bacnet-stack/include/ethernet.h
index 59eec1bc..a2c918e5 100644
--- a/bacnet-stack/include/ethernet.h
+++ b/bacnet-stack/include/ethernet.h
@@ -68,6 +68,14 @@ extern "C" {
     void ethernet_get_broadcast_address(
         BACNET_ADDRESS * dest); /* destination address */
 
+    /* some functions from Linux driver */
+    void ethernet_debug_address(
+        const char *info,
+        BACNET_ADDRESS * dest);
+    int ethernet_send(
+        uint8_t * mtu,
+        int mtu_len);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */
diff --git a/bacnet-stack/ports/linux/ethernet.c b/bacnet-stack/ports/linux/ethernet.c
index 3caf3dd7..a909eec5 100644
--- a/bacnet-stack/ports/linux/ethernet.c
+++ b/bacnet-stack/ports/linux/ethernet.c
@@ -70,10 +70,11 @@ void ethernet_cleanup(
     return;
 }
 
+#if 0
 /*----------------------------------------------------------------------
  Portable function to set a socket into nonblocking mode.
  Calling this on a socket causes all future read() and write() calls on
- that socket to do only as much as they can immediately, and return 
+ that socket to do only as much as they can immediately, and return
  without waiting.
  If no data can be read or written, they return -1 and set errno
  to EAGAIN (or EWOULDBLOCK).
@@ -88,6 +89,7 @@ int setNonblocking(
         flags = 0;
     return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
 }
+#endif
 
 /* opens an 802.2 socket to receive and send packets */
 static int ethernet_bind(
@@ -95,7 +97,9 @@ static int ethernet_bind(
     char *interface_name)
 {
     int sock_fd = -1;   /* return value */
+#if 0
     int sockopt = 0;
+#endif
     int uid = 0;
 
     fprintf(stderr, "ethernet: opening \"%s\"\n", interface_name);