I wrote earlier about getting pkgsrc builds up and working.
Unfortunately, I wrote too soon.
Although Perl built successfully, attempts to build other applications that I'm going to need failed in interesting ways. No Subversion, no xemacs, no SVK. After fiddling with the build infrastructure for a little while and not getting terribly far I've (for the time being) switched to the pre-compiled binary packages provided by Blastwave.
Although they don't have the same building-from-source warm fuzzies that I get from pkgsrc they do at least have the benefit of actually working.
I brought this up on the #pkgsrc IRC channel earlier to see if anyone could offer any advice. The net result is that I'm going to be offering up a jail^H^H^H^Hzone on this machine to one of the pkgsrc developers to use as a Solaris 10 test bed. So Solaris 10 support in pkgsrc might start to get a little better.