Mine

Index: Makefile.PL
===================================================================
--- Makefile.PL (revision 548)
+++ Makefile.PL (working copy)
@@ -9,6 +9,7 @@
                           },
         'EXE_FILES' => [qw(geoqo)],
          'PMLIBDIRS'    => [qw(GeoDB)],
+        'PM_FILTER'  => 'sed -e "s|/usr/share|$(PREFIX)/share|"'
        );

 WriteMakefile(%opts);
@@ -16,8 +17,8 @@
 sub MY::postamble {
     return '

-SCRIPTSDIR=$(DESTDIR)/usr/share/geoqo/scripts
-DATADIR=$(DESTDIR)/usr/share/geoqo/
+SCRIPTSDIR=$(DESTDIR)$(PREFIX)/share/geoqo/scripts
+DATADIR=$(DESTDIR)$(PREFIX)/share/geoqo/

 INSTALL=$(PERL) "-MExtUtils::Command" -e cp