It was released on 5.03.2011 I've tried myself to make an ebuild basing on 5.2.31 ebuild,but with no success. Reproducible: Always
The latest versions no longer compile. I have filed a bug upstream.
I had exactly same errors as you've filled on mysql bugzilla. Thanks for the info, now it's time to wait :)
mysql-workbench-5.2.33 is now in CVS.