[daip] ZLOCK problem

[gtaylor]

Hi Eric et al.,

   I've just installed AIPS on my new powerbook.  In general
all appears to be working well, but I'm getting an error 
when I try to read files off a read-only filesystem (a DVD):

>free
AIPS 1: Disk Volume name               Total Full      Free Timd Access
AIPS 1:  #                            blocks    %    blocks days
AIPS 1:  1  <aips/DATA/LOCALHOST_1  78019632   43  44489760  365 Alluser
AIPS 1:  2  <aips/DATA/LOCALHOST_2   4585952  100         0  365 Alluser
>uc
ZLOCK: Operation not supported
AIPS 1: ZERROR: ON FILE DA02:CAD000000.177;
AIPS 1: ZERROR: IN ZDAOPN ERRNO = 45 (Operation not supported)

Is this easy to fix or have I goofed something up?  Thanks,
                                              - Greg