There exists two compatible implementations for lash, the original lash and ladish. To let the user decide, what implemention he wants to use, the cleanest way in my opinion is a virtual/liblash like several overlays already provide.
I am willing to maintain this ebuild.
See also https://bugs.gentoo.org/show_bug.cgi?id=442916#c6
Would love this ebuild, too. ladi and proaudio overlay defines a virtual/liblash, so the user could choose his favorite implementation. Both overlays workaround the hardcoded lash dependencies in the official tree.
At least it would be useful to create a virtual/liblash, that link to media-sound/lash, so the workarounds are not necessary.
I just looked at the last commits. The last ladish commit was 6 month ago, the last lash commit was 2009.
*** This bug has been marked as a duplicate of bug 442916 ***