--- IO-AIO/AIO.xs	2005/08/22 23:21:57	1.33
+++ IO-AIO/AIO.xs	2005/08/23 00:03:14	1.34
@@ -25,6 +25,8 @@
 #  include <sys/uio.h>
 # elif __hpux
 #  include <sys/socket.h>
+# else
+#  error sendfile support requested but not available
 # endif
 #endif