diff -Nurd gnuradio-3.1.2.orig/usrp/host/lib/legacy/usrp_prims.cc gnuradio-3.1.2/usrp/host/lib/legacy/usrp_prims.cc
--- gnuradio-3.1.2.orig/usrp/host/lib/legacy/usrp_prims.cc	2008-03-05 16:12:38.000000000 -0500
+++ gnuradio-3.1.2/usrp/host/lib/legacy/usrp_prims.cc	2008-07-12 08:04:09.000000000 -0400
@@ -131,10 +131,18 @@
 static struct usb_device *
 dev_handle_to_dev (usb_dev_handle *udh)
 {
+  struct list_head {
+     struct list_head *prev, *next;
+  };
+
   struct usb_dev_handle_kludge {
-    int			 fd;
-    struct usb_bus	*bus;
-    struct usb_device	*device;
+     /* lock protects claimed_interfaces */
+     pthread_mutex_t lock;
+     unsigned long claimed_interfaces;
+
+     struct list_head list;
+     struct usb_device *device;
+     unsigned char os_priv[0];
   };
 
   return ((struct usb_dev_handle_kludge *) udh)->device;