I can download the drivers as you instructed to my mac. My bt4 is running as a vmware image so i navigate to the shared folder where they are located. I compile them and the wl.ko file appears as expected. I issue the commands:
modprobe lib80211
insmod wl.ko

bt4 responds with silence (no errors at least)

but iwconfig or ifconfig -a fails to reveal any wireless interface.
Changing the WPA supplicant driver is next? Please how?
i cannot do the apt-get since I have no ethernet cable.