defines for building on Hurd and BSD kernels

examples/osgcluster/broadcaster.cpp

@@ -45,6 +45,8 @@
     #include <net/soioctl.h>
 #elif defined(__CYGWIN__) 
     #include <unistd.h>
+#elif defined (__GNU__)
+    #include <unistd.h>
 #elif defined(__sun) 
     #include <unistd.h>
     #include <sys/sockio.h>

examples/osgcluster/receiver.cpp

@@ -122,7 +122,7 @@ void Receiver::sync( void )
         return;
     }
 
-#if defined(__linux) || defined(__FreeBSD__) || defined( __APPLE__ )
+#if defined(__linux) || defined(__FreeBSD__) || defined( __APPLE__ ) || defined(__FreeBSD_kernel__) || defined(__GNU__)
     socklen_t size; 
 #else
     int size;