BULK> libmatroska-0.7.7 (multimedia/libmatroska) may not be packaged because:
BULK> "No acceptable compiler found for libmatroska-0.7.7."
BULK>
BULK> libmatroska-0.7.7 (multimedia/libmatroska) is broken because it depends upon libebml-0.7.5 (devel/libebml) which is broken.
Please view the build log for libebml-0.7.5.