rum buildkernel breakeage

Hello,

I'm out of ideas: I have "nodevice rum" in my kernel, also 
WITHOUT_MODULES="rum linux" in my make.conf.
But some code still wants to touch rum which fails with the following:
...
linking kernel.debug
if_rum.o(.text+0x4e3): In function `rum_attach':
/FlashBSD/src/sys/dev/usb/if_rum.c:501: undefined reference to 
`ieee80211_ieee2mhz'
if_rum.o(.text+0x518):/FlashBSD/src/sys/dev/usb/if_rum.c:506: undefined 
reference to `ieee80211_ieee2mhz'
if_rum.o(.text+0x54d):/FlashBSD/src/sys/dev/usb/if_rum.c:511: undefined 
reference to `ieee80211_ieee2mhz'
if_rum.o(.text+0x585):/FlashBSD/src/sys/dev/usb/if_rum.c:516: undefined 
reference to `ieee80211_ieee2mhz'
.....
ieee80211_amrr.o(.text+0xef): In function `ieee80211_amrr_choose':
/FlashBSD/src/sys/net80211/ieee80211_amrr.c:101: undefined reference to 
`ieee80211_note'
ieee80211_amrr.o(.text+0x190):/FlashBSD/src/sys/net80211/ieee80211_amrr.c:125: 
undefined reference to `ieee80211_note'
*** Error code 1

Thanks for hints,

-Harry