The latest version of media-libs/gst-plugins-good in prefix-tree is media-libs/gst-plugins-good-0.10.31, but there are ebuilds in gx86 that depend on >=media-libs/gst-plugins-good-1.2.3, causing installation of those packages to break unless the offending package versions are manually masked.
If we drop *-interix and *-freebsd, the version in gx86 is already prefix ready. interix is dead, but what's about freebsd?
this package is not in prefix tree any more