--- IO-AIO/AIO.xs	2005/08/22 23:20:37	1.32
+++ 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
 
@@ -452,6 +454,7 @@
      res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
 
      if (!res && errno == EAGAIN)
+       /* maybe on others, too, as usual, the manpage leaves you guessing */
        res = sbytes;
    }