Hello,                                              

  JD> Do you use custom kernel? You need options SYSVSHM for
    > the kernel to support shmget(2), and you'd probably
    > also want options SYSVMSG, SYSVSEM.                

Thanks Jaromir, GIMP now launches (and lets me express my
almost complete lack of artistic talent. :-)  Thanks also to
everyone who helped me use (and err... find) ktrace and
kdump, I'll keep them in mind for next time!                 
            
Regards,
  - Andy Ball.