One of the patches added by portage 2.1_pre8 (1020_r3118_bug_121368) uses the -xtype parameter on find call. That parameter is GNU specific, so doesn't work on Alt ports. Also, it seems to me it's used wrongly. As it is, it will look for files owned by portage group that are symlinks to symlinks, while afaics, it should check for files that are links (as it's used to run chmod -h). Replacing -xtype l with -type l seems to work for me on cvs that triggers that part of the code.
*** This bug has been marked as a duplicate of 121368 ***