source: branches/libc-0.6/src/gcc/libiberty/msdos.c

char msg[] = "No vfork available - aborting\n";
vfork()
{
  write(1, msg, sizeof(msg));
}

sigsetmask()
{
  /* no signals support in go32 (yet) */
}

waitpid()
{
  return -1;
}