"stale work directory" error

[Huub]

The one time I saw a similar error message, it turned out to be
correct:  there was a 'work' directory left over from a previous
(failed) build attempt.  Removing the old 'work' directory fixed
the problem.
Thank you, but after removal it continues with this error:

work -> /usr/obj/pkgsrc/devel/glib2/work
WARNING: Package version glib2-2.12.1 in /usr/obj/pkgsrc/devel/glib2/work
WARNING: Current version glib2-2.12.4nb1 in devel/glib2
WARNING: Cleaning and rebuilding glib2-2.12.4nb1...
===> Cleaning for glib2-2.12.4nb1
===> Installing for glib2-2.12.4nb1
cannot create /usr/obj/pkgsrc/devel/glib2/work/.install_makevars.mk.tmp: 
directory nonexistent
*** Error code 2

Any idea about this one?