Created attachment 265947 [details] build.log HTML documentation is installed into /usr/share/doc/${PF} instead of ${EPREFIX}/usr/share/doc/${PF}. See attached build.log.
Created attachment 265949 [details, diff] libao-1.1.0-prefix-docdir.patch Fixes the problem on ~amd64-linux for me.
easy enough that i applied it myself, thanks