#Gentoo PSA: due to my oversight, upgrading sys-kernel/gentoo-kernel-bin to the latest versions on every branch does not result in /usr/src/linux symlink being updated. I will try to fix it in 10 hours.

A workaround is to update the symlink manually or remove it and run `emerge --config gentoo-kernel-bin`. You may need to run `@module-rebuild` afterwards.

This is a one time problem. Once the symlink is updated (or becomes invalid, e.g. through --depclean), subsequent upgrades will update it correctly.

I'm sorry for the trouble.

https://bugs.gentoo.org/977372

[EDIT: pushed a fix]