diff -r 27b183b18d4d -r fa0747c4ad5e src/devices/wifi/mac-low.h
--- a/src/devices/wifi/mac-low.h	Tue Apr 15 15:29:43 2008 -0700
+++ b/src/devices/wifi/mac-low.h	Tue Apr 15 15:53:54 2008 -0700
@@ -22,6 +22,7 @@
 
 #include <vector>
 #include <stdint.h>
+#include <ostream>
 
 #include "wifi-mac-header.h"
 #include "wifi-mode.h"
@@ -252,6 +253,7 @@
   uint32_t GetNextPacketSize (void) const;
 
 private:
+  friend std::ostream &operator << (std::ostream &os, const MacLowTransmissionParameters &params);
   uint32_t m_nextSize;
   enum {
     ACK_NONE,
@@ -263,6 +265,8 @@
   Time m_overrideDurationId;
 };
 
+std::ostream &operator << (std::ostream &os, const MacLowTransmissionParameters &params);
+
 
 /**
  * \brief handle RTS/CTS/DATA/ACK transactions.