As promised, I've built the latest release of Darktable (1.6.8) for Solaris 11.3 Beta. You can get the release details at darktable 1.6.8 .
I've also (finally) set up my own pkg(5) server, so you can simply utter
$ sudo pkg set-publisher -g https://www.jmcpdotcom.com:10001 JMCP $ sudo pkg install 'pkg://JMCP/JMCPdarktable*'
If you'd just like a gzipped p5a, please use this link instead .
Following my previous post I've ensured that the bits were built with