When using crossdev to build for aach64, mesa needs x11-proto/glproto when the "egl" USE flag is set. This is a direct dependency and it's missing from the ebuild.
Note that `--root-deps` seems to figure it out
Which version is affected? Please explain, why a missing dependency is only important while cross compiling. We need to have all information at hand before ticket assignment. That is why I ask you to * attach the logs and * paste the emerge info as described on https://wiki.gentoo.org/wiki/Attach_the_logs_to_the_bug_ticket Please reopen this ticket (Status:UNCONFIRMED) afterwards.