execle (prog, prog, NULL, "FOO=BAR", NULL);
execle (prog, prog, NULL, env);
do_test (void){  static const char prog[] = "does-not-exist";  errno = 0;  execle (prog, prog, NULL, "FOO=BAR", NULL);  if (errno != ENOENT)    {      printf ("errno = %d (%m), expected ENOENT\n", errno);      return 1;    }  return 0;}