In message <Pine.NEB.4.64.0612132148280.180@glacier.reedmedia.net>, "Jeremy C. 
Reed" writes:
>Also see pkgsrc/pkgtools/pkgclean/
>
>  pkgclean cleans up your pkgsrc by removing the work directories.
>  It's a fast alternative for ``cd /usr/pkgsrc && make clean''.

The slowness of make clean is really scary if you compare it to
	rm -rf */*/work

-s