This is an auto-filed bug because media-libs/chromaprint fails to compile. The issue was originally discovered on amd64, but it may be reproducible on other arches as well. If you think that a different summary clarifies the issue better, feel free to change it. Attached build log and emerge --info. NOTE: If you need further logs, feel free to ask.
Created attachment 641126 [details] build.log build log and emerge --info
though this one is older, i'm keeping the one with more detail report. *** This bug has been marked as a duplicate of bug 754255 ***