--- a/examples/energy/energy-model-example.cc	
+++ a/examples/energy/energy-model-example.cc	
@@ -35,7 +35,7 @@ 
 
 using namespace ns3;
 
-std::string
+static inline std::string
 PrintReceivedPacket (Address& from)
 {
   InetSocketAddress iaddr = InetSocketAddress::ConvertFrom (from);
--- a/examples/routing/manet-routing-compare.cc	
+++ a/examples/routing/manet-routing-compare.cc	
@@ -119,7 +119,7 @@ 
 {
 }
 
-std::string
+static inline std::string
 PrintReceivedPacket (Ptr<Socket> socket, Ptr<Packet> packet)
 {
   SocketAddressTag tag;
--- a/examples/wireless/multirate.cc	
+++ a/examples/wireless/multirate.cc	
@@ -309,14 +309,14 @@ 
     }
 }
 
-Vector
+static inline Vector
 GetPosition (Ptr<Node> node)
 {
   Ptr<MobilityModel> mobility = node->GetObject<MobilityModel> ();
   return mobility->GetPosition ();
 }
 
-std::string
+static inline std::string
 PrintPosition (Ptr<Node> client, Ptr<Node> server)
 {
   Vector serverPos = GetPosition (server);
--- a/examples/wireless/wifi-simple-interference.cc	
+++ a/examples/wireless/wifi-simple-interference.cc	
@@ -96,7 +96,7 @@ 
 
 using namespace ns3;
 
-std::string PrintReceivedPacket (Ptr<Socket> socket)
+static inline std::string PrintReceivedPacket (Ptr<Socket> socket)
 {
   Address addr;
   socket->GetSockName (addr);
@@ -108,7 +108,7 @@ 
   return oss.str ();
 }
 
-void ReceivePacket (Ptr<Socket> socket)
+static void ReceivePacket (Ptr<Socket> socket)
 {
   NS_LOG_UNCOND (PrintReceivedPacket (socket));
 }
--- a/src/test/ns3wifi/wifi-interference-test-suite.cc	
+++ a/src/test/ns3wifi/wifi-interference-test-suite.cc	
@@ -77,7 +77,7 @@ 
 {
 }
 
-std::string
+static inline std::string
 PrintReceivedPacket (Ptr<Socket> socket)
 {
   Address addr;