Can someone please refresh my memory as to why my attempts at running
SunOS 4.1.x binaries under NetBSD/SPARC64 1.5 are failing with ENOMEM?

For example, here's what I get when I try to run Adobe Acrobat Reader 3.01:

[21:15] netbsd4me:/tmp % kdump
  4560 ktrace   EMUL  "netbsd"
  4560 ktrace   RET   ktrace 0
  4560 ktrace   CALL  execve(0xffffffffffffd5b7,0xffffffffffffd410,0xffffffffffffd420)
  4560 ktrace   NAMI  "/usr/pkg/Acrobat3/Reader/sparcsun/bin/acroread"
  4560 ktrace   RET   execve -1 errno 12 Cannot allocate memory
  4560 ktrace   CALL  write(0x2,0xffffffffffffc7f0,0x8)
  4560 ktrace   GIO   fd 2 wrote 8 bytes
       "ktrace: "
  4560 ktrace   RET   write 8
  4560 ktrace   CALL  write(0x2,0xffffffffffffc8b0,0x3f)
  4560 ktrace   GIO   fd 2 wrote 63 bytes
       "exec of '/usr/pkg/Acrobat3/Reader/sparcsun/bin/acroread' failed"
[...]

I've got "netbsd32_compat15-1.0" installed, "netbsd32_compat14-1.0" installed,
and a fully-populated compat_sunos(8) tree (4.1.4 libs) under "/emul/sunos".

Answers of "You need -current to run SunOS 4.1.x binaries on the Ultra port"
are depressing, but acceptable.  (-:  (Otherwise, tell me what I'm missing)

	- Greg