airodump-ng-oui-update is defined as a #!/bin/bash script. However, when edited to #!/bin/sh it appears to work fine.
bmarkus, I'd suggest that whenever you next time upgrade anyway, that you could edit the script accordingly. (However, airdriver-ng contained in same extension is indeed a #!/bin/bash script).
Modification in svn arranged
(
http://trac.aircrack-ng.org/changeset/1826)