QMutex: mutex destroy failure: Device busy -> Seg fault in ports/x11/kdebase4-workspace

On ia64 HEAD while building x11/kdebase4-workspace
I get lots of messages similar to:

	QWaitCondition: mutex destroy failure: Device busy
	QMutex: mutex destroy failure: Device busy

culminating in this error:


[skip]


Linking CXX shared module ../../lib/kgreet_generic.so
[ 10%] Built target kgreet_generic
[ 10%] Generating org.kde.Kephal.Screens.xml
QMutex: mutex destroy failure: Device busy
[ 10%] Generating org.kde.Kephal.Outputs.xml
[ 10%] Generating org.kde.Kephal.Configurations.xml
Segmentation fault (core dumped)
*** Error code 139
1 error
*** Error code 2
Linking CXX shared module ../../lib/kgreet_winbind.so
[ 10%] Built target kgreet_winbind
1 error
*** Error code 2
1 error
*** Error code 1

Stop in /usr/ports/x11/kdebase4-workspace.
*** Error code 1


Please advise
anton

PS. I don't really need KDE at all. But Marcel reports that
konqueror seems to be working. So I just want to build this.
At present there's no
secure graphical web browser for ia64. Until recently
kazehakase was working. But now it doesn't, because security/nss
doesn't build. And firefox doesn't build because of broken xpcom..

-- 
Anton Shterenlikht
Room 2.6, Queen's Building
Mech Eng Dept
Bristol University
University Walk, Bristol BS8 1TR, UK
Tel: +44 (0)117 331 5944
Fax: +44 (0)117 929 4423