I got the same error when I first compiled this package (this is the one
by Robert Leslie, right?).  I had to add a -DNO_DEVLOCKS or something
similar (check the docs that it came with) to the Makefile in order to
get it to work.

Does anyone know if the error occurs because you can't obtain a file
lock (via flock) on a device file?

    -- Johnny C. Lam
       Department of Statistics
       Carnegie Mellon University
       lamj@stat.cmu.edu

Excerpts from internet.computing.netbsd.port-mac68k: 12-Nov-96  by
briggs@puma.macbsd.com 
> Hi, 
> 
> I'm trying to get hfsutils 1.0b(7?) to work on my system.
> I could compile the program all right, but when i tried to
> hmount a hfs partition, 
> 
> % hmount /dev/sd1d 
> 
> it quitted with an error message:
> 
> % cannot obtain lock on device /dev/sd1d (Operation not supported)
> 
> What does this mean?  Any help would be greatly appreciated!
> 
> Thanks!
> 
> chi on
>