Index: uspace/lib/net/include/protocol_map.h
===================================================================
--- uspace/lib/net/include/protocol_map.h	(revision 018d79b84a1807df9af40b1bc9f07660b929a662)
+++ uspace/lib/net/include/protocol_map.h	(revision fd8e8e1bdc24e6988dc181ca0cab34d17aac6da7)
@@ -45,9 +45,9 @@
 #include <ipc/services.h>
 
-eth_type_t protocol_map(services_t, services_t);
-services_t protocol_unmap(services_t, int);
-eth_type_t lsap_map(eth_lsap_t);
-eth_lsap_t lsap_unmap(eth_type_t);
-hw_type_t hardware_map(services_t);
+extern eth_type_t protocol_map(services_t, services_t);
+extern services_t protocol_unmap(services_t, int);
+extern eth_type_t lsap_map(eth_lsap_t);
+extern eth_lsap_t lsap_unmap(eth_type_t);
+extern hw_type_t hardware_map(services_t);
 
 #endif