LuxRays is a part of LuxRender core that has been turned into a generic GMGPU-accelerated ray library.
While GMGPU support in FreeBSD is rather lacking, LuxRays is a required dependency of recent versions of LuxRender. It is compiled only with its CPU fallback code.
Fix: Patch attached with submission follows:
I'll take it.
New port added, with minor changes. Thanks!