-The following platforms are @emph{not} supported by Gnulib. Even correct
-patches for their support will not be applied.
+The following platforms are not supported by Gnulib. The cost of
+supporting them would exceed the benefit because they are rarely used, or
+poorly documented, or have been supplanted by other platforms, or diverge
+too much from POSIX, or some combination of these and other factors.
+Please don't bother sending us patches for them.