This change should build

diff --git a/lib/isc/unix/socket.c b/lib/isc/unix/socket.c
index 17012ed..b4c1c3f 100644
--- a/lib/isc/unix/socket.c
+++ b/lib/isc/unix/socket.c
@@ -306,7 +306,11 @@ typedef isc_event_t intev_t;
  * The size to raise the receive buffer to (from BIND 8).
  */
 #ifdef TUNE_LARGE
+#ifdef sun
+#define RCVBUFSIZE (1*1024*1024)
+#else
 #define RCVBUFSIZE (16*1024*1024)
+#endif
 #else
 #define RCVBUFSIZE (32*1024)
 #endif /* TUNE_LARGE */