The simplest way for you to build your binary would be to run a VM of your target OS and arch on your online machine, build the binary from that, then take it to your offline signer.
armory_0.96.2-ubuntu14.04-i386_offline.tar.gz might be worth trying too..? Though with caveats. Hoping they'll have any other dependencies already, for one, and not using segwit being another.