OK, we're getting there. I was able to get RC1 working - a step above my last attempt. Now on to the SVNs. I rebuilt GTK as suggested by daniel2000. That worked without any problems, so I installed the new package (2.6.2) and so far everything seems to behave itself.
The 08 May 2006 build of C::B, however, now complains about needing libstdc++.so.6:
libstdc++.so.6(GLIBCXX_3.4.4) is needed by codeblocks...
libstdc++.so.6(GLIBCXX_3.4.6) is needed by codeblocks...
Thing is, libstdc++.so.6 exists in /usr/lib as a link to libstdc++.so.6.0.3. So, it exists, but the C::B installation can't find it?? I'm using gcc 3.4.5, in case that helps.
-Kirk