diff -urN libusb-0.1.8/darwin.c libusb-0.1.8.darwin/darwin.c
--- libusb-0.1.8/darwin.c	Tue Jan 27 14:36:31 2004
+++ libusb-0.1.8.darwin/darwin.c	Wed Jan  5 19:43:17 2005
@@ -689,7 +689,7 @@

   /* there seems to be no way to determine how many bytes are actually written */
 #if !defined (LIBUSB_NO_TIMEOUT_INTERFACE)
-  if ( transferType == kUSBInterrupt )
+  if ( transferType != kUSBInterrupt )     /*** DARWIN 0.1.8 FIX ***/
     result = (*(device->interface))->WritePipeAsyncTO(device->interface, pipeRef,
 						      bytes, size, 0, timeout,
 						      write_completed, NULL);