Okay I'm not really sure how to solve this but I'd suggest it should be moved into /opt even if it's just _one_ payload to be binary...
I think you speak about /usr/lib/w3af/plugins/attack/payloads/code/netcat I grep netcat on w3af sources and i see nothing that use it at this place. Seems that netcat_installed.py check for a netcat in classic path (/bin/netcat /bin/nc /etc/alternative/netcat) So, i will update the ebuild to delete this static executable and add one of the netcat availlable in portage to the dependency
Thanks, that looks perfect.
Fixed