Most of my code lives in the OS/Net consolidation of OpenSolaris (also known as ON). That's true for a lot of other OpenSolaris developers as well, since the majority of the kernel, drivers, and core system software all lives in that consolidation. (Desktop software like Gnome, X, and other pieces of the operating system live in different consolidations.)
It only makes sense to be able to compile the software I primarily work on using my OpenSolaris systems rather than relying on an SXCE build machine. A few folks, primarily Ed and Sherry had assembled early instructions last year. The early instructions required copying some bits from SXCE systems, and installing extra packages. But, since then all of the required packages have been made available in IPS form, and some new requirements have cropped up. I updated the webpage that was put together from Ed's instructions, but the list of packages to install had grown to a fairly large number -- 28 at current count. Rather than forcing people to cut and paste the entire list, I created an IPS package which contains all the dependencies required. That package integrated into OpenSolaris build 111a, now available at the standard http://pkg.opensolaris.org/dev development build repository. Once you're running 111a (and have added the extra repository to be able to add a few unfortunately non-redistributable packages), you can pkg install osnet. The package is fully specified as pkg:/developer/opensolaris/osnet.
I'll keep updating developer/opensolaris/osnet with new additions and changes, and any special instructions will be maintained on Indiana's building ON page, which was the subject of an ON heads-up, and is linked to from every place that I could think of, including the Indiana project, the ON community, and a few other spots. But I'll link again here for emphasis, since it will be the best place to get up-to-date instructions for a while: http://opensolaris.org/os/project/indiana/building_on/.
Next up, I'm working on getting ON to spit out an IPS repo from the binaries it generates... more news on that here and in the ON community as it develops.