The way @INC is laid out by default, one cannot upgrade core (dual-life)
modules without overwriting files. This causes problems for binary
-package builders.
+package builders. One possible proposal is laid out in this
+message:
+L<http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2002-04/msg02380.html>.
=head2 -Duse32bit*