I own a few different versions of the Omega 2's, but hadn't done much with them for a long time. Just pulled them out to try running a python script I wrote for passive OS fingerprinting, but it needs the libpcap headers in the development package (libpcap-dev).
I don't see it available in the main repositories for onion and a quick glance I don't see it in openwrt, but hopefully I just missed it.
Any chance there is an official package out there somewhere?