Only in new: qemu_driver.c
diff -rup libvirt-0.7.1/src/hostusb.c new/src/hostusb.c
--- libvirt-0.7.1/src/hostusb.c	2010-06-03 13:51:14.392459000 -0400
+++ new/src/hostusb.c	2010-06-03 14:49:11.763379000 -0400
@@ -123,7 +123,7 @@ static int usbFindBusByVendor(virConnect
             char *tmpstr = de->d_name;
             unsigned found_bus, found_addr;
 
-            if (STREQ(de->d_name, "usb"))
+            if (STRPREFIX(de->d_name, "usb"))
                 tmpstr += 3;
 
             if (virStrToLong_ui(tmpstr, &ignore, 10, &found_bus) < 0) {