As per http://forums.gentoo.org/viewtopic-p-6647391.html
Problematic file: usr/lib64/libgdkmm-2.4.la
Please file a bug report with all information inside the bug report.
Removed .la files from both atkmm and gtkmm per this report. Thanks for reporting.
(In reply to comment #1)
> Please file a bug report with all information inside the bug report.
Like I just told on #gentoo-desktop at IRC:
The user provided all the required information there is to provide, the problem is in $summary and the problematic file is in Comment #0.
- Remove the .la files from said package.
- Empty the dependency_libs to '' like what imagemagick/libcanberra and redland does now. See their ebuilds. This should only be done for packages that use libltdl for loading plugins, it shouldn't be applied to packages where they are simply useless.