Just a little news to promote the work done by Alan Hargreaves for providing non-debug encumbered binaries for the latest ON sources at this time, for x64 platform only (yet).
As a side note, you can find a very nice how to on the (updated) required steps to build a (non-debug) OpenSolaris from the Solaris Express Community Release distribution, written by well known Dennis Clarke.
Not yet tested myself, but i hope to do so in the next days, or weeks...