This is Debian unstable. I didn't compile Perl, it is Debian's 5.8.7-4.

$ perl '-V:install.*'
installarchlib='/usr/lib/perl/5.8';
installbin='/usr/bin';
installhtml1dir='';
installhtml3dir='';
installman1dir='/usr/share/man/man1';
installman3dir='/usr/share/man/man3';
installprefix='/usr';
installprefixexp='/usr';
installprivlib='/usr/share/perl/5.8';
installscript='/usr/bin';
installsitearch='/usr/local/lib/perl/5.8.7';
installsitebin='/usr/local/bin';
installsitehtml1dir='';
installsitehtml3dir='';
installsitelib='/usr/local/share/perl/5.8.7';
installsiteman1dir='/usr/local/man/man1';
installsiteman3dir='/usr/local/man/man3';
installsitescript='/usr/local/bin';
installstyle='lib/perl5';
installusrbinperl='undef';
installvendorarch='/usr/lib/perl5';
installvendorbin='/usr/bin';
installvendorhtml1dir='';
installvendorhtml3dir='';
installvendorlib='/usr/share/perl5';
installvendorman1dir='/usr/share/man/man1';
installvendorman3dir='/usr/share/man/man3';
installvendorscript='/usr/bin';

$ grep -wE "lib|share" $(locate Config.pm)
/usr/lib/perl/5.8.7/Config.pm:die "Perl lib version (v5.8.7) doesn't m
+atch executable version ($])"
/usr/lib/perl/5.8.7/Config.pm:    or die "Perl lib version (v5.8.7) do
+esn't match executable version (" .
/usr/lib/perl/5.8.7/Config.pm:    archlibexp => '/usr/lib/perl/5.8',
/usr/lib/perl/5.8.7/Config.pm:    libpth => '/usr/local/lib /lib /usr/
+lib',
/usr/lib/perl/5.8.7/Config.pm:    privlibexp => '/usr/share/perl/5.8',
/usr/lib/perl/5.8.7/Config.pm:    sitearchexp => '/usr/local/lib/perl/
+5.8.7',
/usr/lib/perl/5.8.7/Config.pm:    sitelibexp => '/usr/local/share/perl
+/5.8.7',
/usr/share/perl5/Debconf/Config.pm:our @config_files=("/etc/debconf.co
+nf", "/usr/share/debconf/debconf.conf");
[download]

I never touched any Config.pm. Actually, I know very little about how Perl works. I'm inclined to think that the cause of this has to do with the modules themselves, its their Makefiles or so. I can paste them in my scratchpad (appropriately trimmed) if it matters.