Some modules which are included in core set INSTALLDIRS => 'perl'
explicitly in Makefile.PL.  This makes sense for the normal @INC
ordering, but not ours.  Provide a sensible default.

diff -Naur --exclude=debian perl-5.8.8.orig/lib/CPAN/FirstTime.pm perl-5.8.8/lib/CPAN/FirstTime.pm
--- perl-5.8.8.orig/lib/CPAN/FirstTime.pm	2006-01-31 08:08:57.000000000 +1100
+++ perl-5.8.8/lib/CPAN/FirstTime.pm	2006-02-03 00:05:24.000000000 +1100
@@ -358,7 +358,7 @@
 
 };
 
-    $default = $CPAN::Config->{makepl_arg} || "";
+    $default = $CPAN::Config->{makepl_arg} || "INSTALLDIRS=site";
     $CPAN::Config->{makepl_arg} =
 	prompt("Parameters for the 'perl Makefile.PL' command?
 Typical frequently used settings:
