diff -Naur dclib-0.3.21.old/dclib/core/cnetaddr.cpp dclib-0.3.21/dclib/core/cnetaddr.cpp
--- dclib-0.3.21.old/dclib/core/cnetaddr.cpp	2008-11-03 07:06:58.649243531 +0200
+++ dclib-0.3.21/dclib/core/cnetaddr.cpp	2008-11-03 07:08:47.956170656 +0200
@@ -31,6 +31,10 @@
 #include <netdb.h>
 #endif
 
+#if defined(__sun) && defined(__SVR4)
+#include <sys/sockio.h>
+#endif
+
 /* if_nameindex() */
 #include <net/if.h>