errno = 0;
ASSERT (setenv ("a=b", "", 0) == -1);
ASSERT (errno == EINVAL);
+#if 0
+ /* glibc and gnulib's implementation guarantee this, but POSIX no
+ longer requires it: http://austingroupbugs.net/view.php?id=185 */
errno = 0;
ASSERT (setenv (NULL, "", 0) == -1);
ASSERT (errno == EINVAL);
+#endif
return 0;
}