It's even more sinister, folks.  I dropped down to single-user mode and
tried to run it (13 Kb of swap used, no MFS /tmp mounted, 5 processes in all)
and it *still* failed with ENOMEM.

Oh, David asked about the ktrace, well it simply fails the execve():

netbsd4me:1:24 % ktrace netscape-4.0beta3
ktrace: exec of 'netscape-4.0beta3' failed: Cannot allocate memory
netbsd4me:1:25 % kdump 
   375 ktrace   RET   ktrace 0
   375 ktrace   CALL  __sysctl(0xf7ffe668,0x2,0xf328,0xf7ffe664,0,0)
   375 ktrace   RET   __sysctl 0
   375 ktrace   CALL  break(0xf368)
   375 ktrace   RET   break 0
   375 ktrace   CALL  break(0xfffc)
   375 ktrace   RET   break 0
   375 ktrace   CALL  break(0x10ffc)
   375 ktrace   RET   break 0
   375 ktrace   CALL  execve(0xf7ffe7b0,0xf7ffec80,0xf7ffec88)
   375 ktrace   NAMI  "/usr/local/bin/netscape-4.0beta3"
   375 ktrace   RET   execve -1 errno 12 Cannot allocate memory

I'm going to try 4.0beta3 on a regular SunOS 4.1.x machine next and see what
happens ...

Installing 4.0beta3 seems to have killed my older Netscapes
(well, 3.01 and 4.0beta2 at least).  They now die with
"dlopen: stub interception failed" errors and promptly Bus error.  :-(

Oh, to the person who wanted my MFS /tmp line from fstab:

netbsd4me:1:27 % egrep tmp /etc/fstab
/dev/sd0b       /tmp            mfs rw,-s=40960 0 0

I've had no problems at all using an MFS /tmp with NetBSD/SPARC, works great.

	- Greg