after (randomly) activating some random packages to debug/play with stuff
"make menuconfig" from a clean svn couldn't built an image any more :

ERROR: module '/mnt/HGST/Media/programming/openwrt/trunk/build_dir/target-mipsel_uClibc-0.9.33.2/linux-brcm47xx/compat-wireless-2013-01-07/drivers/net/wireless/brcm80211/brcmutil/brcmutil.ko' is missing.
make[3]: *** [/mnt/HGST/Media/programming/openwrt/trunk/bin/brcm47xx/packages/kmod-brcmutil_3.6.11+2013-01-07-1_brcm47xx.ipk] Error 1