Old versions are inheriting old clutter.eclass from main tree, which has since been deprecated and deleted. These modification might be unnecessary anyways in a VC4 mesa driver world future. Gentoo-Bug: 574524
Otherwise versioned checks for wayland-egl package fail. In particular, gst-plugins-bad needs at least version 9.0 (probably a mesa[egl] ver)
It checks for egl libraries with USE=egl too in configure, not just when USE=webgl is given. As they are force coupled with rpi, append the flags when either egl or gles2 USE flags are given (though REQUIRED_USE mostly takes care of it too, iirc).
I didn't end up bumping this in main tree yet, so for now make the snapshot tarball available from my devspace and use it. Before I had it only available locally and no-one could use this rpi-userland version bump.