diff -Naur RTL8192CU-v4.0.2_9000.20130911/include/ieee80211.h RTL8192CU-v4.0.2_9000.20130911.patch/include/ieee80211.h
--- RTL8192CU-v4.0.2_9000.20130911/include/ieee80211.h	2013-09-11 05:56:55.000000000 +0200
+++ RTL8192CU-v4.0.2_9000.20130911.patch/include/ieee80211.h	2015-11-03 14:05:03.789280151 +0100
@@ -1194,18 +1194,18 @@
 (((Addr[2]) & 0xff) == 0xff) && (((Addr[3]) & 0xff) == 0xff) && (((Addr[4]) & 0xff) == 0xff) && \
 (((Addr[5]) & 0xff) == 0xff))
 #else
-extern __inline int is_multicast_mac_addr(const u8 *addr)
+static __inline int is_multicast_mac_addr(const u8 *addr)
 {
         return ((addr[0] != 0xff) && (0x01 & addr[0]));
 }
 
-extern __inline int is_broadcast_mac_addr(const u8 *addr)
+static __inline int is_broadcast_mac_addr(const u8 *addr)
 {
 	return ((addr[0] == 0xff) && (addr[1] == 0xff) && (addr[2] == 0xff) &&   \
 		(addr[3] == 0xff) && (addr[4] == 0xff) && (addr[5] == 0xff));
 }
 
-extern __inline int is_zero_mac_addr(const u8 *addr)
+static __inline int is_zero_mac_addr(const u8 *addr)
 {
 	return ((addr[0] == 0x00) && (addr[1] == 0x00) && (addr[2] == 0x00) &&   \
 		(addr[3] == 0x00) && (addr[4] == 0x00) && (addr[5] == 0x00));