I found texlive 64 in untested and downloaded it. Tried lyx and it didn't work (could not find texlive). I then installed texlive using installpkg from root and it seemed to install, with errors. Reconfigured lyx. But lyx still wouldn't recognize texlive. Texlive is normally in /usr/local but it is not there. Installpkg gave several errors (automake, mmake etc). I expect that is the problem.
I will look into it further as time permits.