BTW, the following seems to fix this issue:

RCS file: /cvsroot/src/sys/dev/usb/usb.c,v
retrieving revision 1.92
diff -u -p -r1.92 usb.c
--- usb.c       3 Dec 2006 22:34:58 -0000       1.92
+++ usb.c       5 Dec 2006 13:40:32 -0000
@@ -446,7 +446,9 @@ usbread(dev_t dev, struct uio *uio, int

         useold = 0;
         /* XXXGCC */
+#ifdef COMPAT_30
         ueo = NULL;
+#endif
         switch (uio->uio_resid) {
  #ifdef COMPAT_30
         case sizeof(struct usb_event_old):


On Tue, 5 Dec 2006, Paul Goyette wrote:

> Updated via CVS just 15 minutes ago...
>
> #   compile  QUICKY/usb.o
> /usr/src/obj.amd64/tooldir.NetBSD-4.99.4-x86_64/bin/x86_64--netbsd-gcc 
> -mcmodel=kernel -mno-red-zone -ffreestanding -fno-zero-initialized-in-bss -O2 
> -Werror -Wall -Wno-main -Wno-format-zero-length -Wpointer-arith 
> -Wmissing-prototypes -Wstrict-prototypes -Wswitch -Wshadow -Wcast-qual
> -Wwrite-strings -Wno-sign-compare -Wno-pointer-sign -Wno-attributes
> -fno-strict-aliasing -Damd64 -Dx86_64 -I. -I/usr/src/sys/../common/include
> -I/usr/src/sys/arch -I/usr/src/sys -nostdinc -DLKM -DMAXUSERS=32 -D_KERNEL
> -D_KERNEL_OPT -I/usr/src/sys/lib/libkern/../../../common/lib/libc/quad
> -I/usr/src/sys/lib/libkern/../../../common/lib/libc/string 
> -I/usr/src/sys/lib/libkern/../../../common/lib/libc/arch/x86_64/string 
> -I/usr/src/sys/dist/ipf -c /usr/src/sys/dev/usb/usb.c
>
> /usr/src/sys/dev/usb/usb.c: In function 'usbread':
> /usr/src/sys/dev/usb/usb.c:449: error: 'ueo' undeclared (first use in this 
> funct
> ion)
> /usr/src/sys/dev/usb/usb.c:449: error: (Each undeclared identifier is 
> reported o
> nly once
> /usr/src/sys/dev/usb/usb.c:449: error: for each function it appears in.)
> /usr/src/sys/dev/usb/usb.c: In function 'usbioctl':
> /usr/src/sys/dev/usb/usb.c:652: error: 'dio' undeclared (first use in this 
> funct
> ion)
> *** [usb.o] Error code 1
> 1 error
>
>
> ----------------------------------------------------------------------
> |   Paul Goyette   | PGP DSS Key fingerprint: |  E-mail addresses:   |
> | Network Engineer | FA29 0E3B 35AF E8AE 6651 |  paul@whooppee.com   |
> |                  | 0786 F758 55DE 53BA 7731 | pgoyette@juniper.net |
> ----------------------------------------------------------------------
>

----------------------------------------------------------------------
|   Paul Goyette   | PGP DSS Key fingerprint: |  E-mail addresses:   |
| Network Engineer | FA29 0E3B 35AF E8AE 6651 |  paul@whooppee.com   |
|                  | 0786 F758 55DE 53BA 7731 | pgoyette@juniper.net |
----------------------------------------------------------------------