Need add in DEPEND x11-proto/presentproto and x11-proto/dri3proto or we have error on compile stage with no find header file.
commit b671883c631a7e23703c7bb50776ec7129d7f78e Author: Igor Savlook <isav@alzari.pw> Date: Thu Jul 20 20:16:58 2017 +0300 x11-drivers/xf86-video-virtualbox: add missing dependencies The current ebuild is missing a dependency on * x11-proto/presentproto * x11-proto/dri3proto Bug: https://bugs.gentoo.org/625748