You are probably using the wrong git branch (try omega2 or onion-omega2). Try the original lede project depot. The omega2 support is in the main branch.
thanks for pointing that out. i totally missed those notes added at the bottom.
@Luciano-S. OK. I will put something together and put it on git hub. Will post here when it's done
Finally had time to get back to this
Have now set up a more lightweight and up to date system on a VM - kubuntu 14.04
Have managed to proceed further following instructions in: https://github.com/OnionIoT/OpenWRT-Packages/wiki/Setting-Up-the-Cross-Compile-Environment
Got as far as Step 6a: make
This initially failed, but I tracked the problem down to not having texinfo
Resolved by using apt-get install texinfo
Perhaps this should be mentioned in the above referenced link?