It would be nice to add ~arm KEYWORDS to alsa-oss. I tested alsa-oss successfully on BeagleBone black with this program : TinySid https://github.com/linuxunderground/gentoo.overlay/tree/master/media-sound/tinysid $ aoss tinysid my_sid_file.sid It works very well.
*** Bug 544686 has been marked as a duplicate of this bug. ***
+ 28 Mar 2015; Yixun Lan <dlan@gentoo.org> alsa-oss-1.0.28.ebuild: + keyword ~arm, bug 544684, thanks Vincent Hardy for reporting