Attempting to get around the gcc 3.3 to 3.4 issue from the start, I did a minimal stage 3 install of 2005.1, then added in my USE flags and followed the 'emerge -e' approach outlined in the article, so I would never have 'gcc 3.3' related issues. During 'emerge -e world', doxygen compilation failed with a message that it needs qt. 'emerge -evp world' lists qt to compile after doxygen, so it's circular. Since 'emerge -e' ignores '-n', I'm doomed to compile qt twice, and 'emerge -e world' twice as well, and I lost many hours in an overnight build when it stopped prematurely (to give some sense of consequence and importance for this bug). My gentoo system isn't working yet, no networking, no internet, so I'm writing this on another system, but I think the issue would be obvious in the ebuilds. Obviously I have 'qt' in make.conf, and 'doc' as well, but I don't know what else might be relevant.
*** This bug has been marked as a duplicate of 81632 ***