Hi - I've just finished updating the OpenSolaris Install Download Center with updated versions of three packages that are needed in order to build the slim_source project. The download center is located at http://dlc.sun.com/osol/install/downloads/current/ . Instructions for building the slim_source gate are found at: http://opensolaris.org/os/project/indiana/status/accessibility/constructor_notes/. I've set these up as datastream files, so you'll need to run the pkgadd command. We hope to have them converted to IPS packages soon. I'll see about updating the instructions on the constructor_notes page, above to include a download step.
If you have any questions, let me know. -- Ginnie