xephyr on netbsd-9

[nia <nia%NetBSD.org@localhost>]

X11_TYPE=native. This worked before the update, but now:

Package dependency requirement 'fixesproto >= 6.0' could not be satisfied.
Package 'fixesproto' has version '5.0', required version is '>= 6.0'
Package dependency requirement 'inputproto >= 2.3.99.1' could not be satisfied.
Package 'inputproto' has version '2.3.2', required version is '>= 2.3.99.1'

Adding:

BUILDLINK_API_DEPENDS.xorgproto+=       xorgproto>=2022.2

seems to cause a cascade of Things We Do Not Want, including using
libX11 from pkgsrc. Why? xorgproto is a build-only dependency.
Does anyone understand what's going on here?