xextproto is not installed; can't buildlink files

[Jukka Salmi <j+nbsd%2006.salmi.ch@localhost>]

Hello,

using HEAD pkgsrc on a -current NetBSD/i386 system, building several
packages like www/firefox and graphics/hicolor-icon-theme currently
fails with

===> wrapper-message [...] ===> Creating toolchain wrappers for [...]
ERROR: xextproto is not installed; can't buildlink files.
*** Error code 1

Is anybody else seeing this? What could cause this problem?

TIA, Jukka

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