compat_svr4 problems

[raymond.meyer%rambler.ru@localhost]

I run NetBSD 32-bit sun4u kernel with 32-bit userland. Trying to use Solaris 
32-bit binaries (from Nevada build 98) with compat_svr4, but every binary 
dumps core

# ./ls
[1]   Bad system call (core dumped) ./ls

# ktruss -t A ./ls
  1264      1 ktruss   emul(netbsd)
  1264      1 ktruss   fcntl(0x4, 0x3, 0)          = 1, 3
  1264      1 ktruss   fcntl(0x4, 0x4, 0x1)        = 0, 4
  1264      1 ls       emul(svr4)
  1264      1 ls       execve("./ls", 0xffffcc88, 0xffffcc90) JUSTRETURN
  1264      1 ls       #229 (unimplemented)()      Err#89 ENODATA
  1264      1 ls       SIGSYS SIG_DFL

Any ideas? What does #229 (unimplemented) mean?