Problems with "make clean"

[Frank Wißmann]

Hi, Beasties!
I just installed the new VirtualBox through ports. It worked fine, but 
now I have trouble cleaning the directory. Neither "make clean" nor a 
"rm -rf work/" do what they are supposed to. Here is the output:

rm: 
work/virtualbox-3.0.51r22902/out/freebsd.amd64/debug/obj/VBoxRT/VBox: 
Directory not empty
rm: 
work/virtualbox-3.0.51r22902/out/freebsd.amd64/debug/obj/VBoxRT/common: 
Directory not empty
rm: work/virtualbox-3.0.51r22902/out/freebsd.amd64/debug/obj/VBoxRT: 
Invalid argument
rm: work/virtualbox-3.0.51r22902/out/freebsd.amd64/debug/obj: Directory 
not empty
rm: work/virtualbox-3.0.51r22902/out/freebsd.amd64/debug: Directory not 
empty
rm: work/virtualbox-3.0.51r22902/out/freebsd.amd64: Directory not empty
rm: work/virtualbox-3.0.51r22902/out: Directory not empty
rm: work/virtualbox-3.0.51r22902: Directory not empty
rm: work/: Directory not empty

A "cd" to the named directories and a "ls -la" show no files there. Has 
anybody an explanation for this?

Greetings Frank

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