+ <p>
+ These locations, particularly <tt>$Config{sitearch}</tt>,
+ may change if the binary interface between the
+ Perl interpreter and compiled modules has to be
+ changed in an incompatible way without a change in
+ <var>version</var>. While this will only be done as a
+ last resort, packages should use <tt>$Config{sitelib}</tt>
+ and <tt>$Config{sitearch}</tt>, not hardcode the current
+ locations.<footnote>Build systems based on
+ <tt>ExtUtils::MakeMaker</tt> and <tt>Module::Build</tt>
+ do this automatically.</footnote>
+ <p>