[ubuntu] What am I now doing wrong with compiling LibVirt from scratch for esx driver support?

So I like to tote myself as an intermediate linux user. But occasionally i take on a side project of my own imagination, and I fall out of my depth. Today I was finishing setting up Cuckoo Malware Sandbox configured to run an ESXI server, but I ran into a problem. I need to recompile libvirt for use with the esx driver (further reading: http://www.libvirt.org/drvesx.html). So even though I have already installed LibVirt, I grabbed the source from Git to recompile. I followed all the instructions here: http://libvirt.org/compiling.html (bottom of page at compile from Git checkout) but I am still getting the cuckoo error "Libvirt returned an exception on connection: unsupported configuration: libvirt was built without the 'esx' driver."

What I am missing?

Please let me know if you need more information.

Thanks!