Hi im not an advanced linux user but I usually get things going with some help from mr google.

I have a Raspbarrry Pi which I have loaded the default Debian os

I got the whole aircrack-ng suit to install from source and its working fine.

The extra program Airdrop-ng need the dependencies: lrcon and pylorcon as described here aircrack-ng.org/doku.php?id=airdrop-ng

so when I tried to install lrcon as described it needed libcap so i installed it from here linuxfromscratch.org/blfs/view/svn/basicnet/libpcap.html

and then lrcon also needed libnl for the drivers so I installed it
packages.debian.org/wheezy/libnl-dev

Now to my problem,When I run airdrop-ng it says: Interface wlan0 does not exist, and it doesnt matter if I try mon0 which is in monitor mode.
I found the sourcecode for airdrop-ng here:
trac.aircrack-ng.org/svn/trunk/scripts/airdrop-ng/airdrop-ng

So I wonder whats the problem. I know my card can inject as I have tried.
I really appreciate if you can look in to it for me