--- /dev/null
+diff --git a/inc/Module/Install/RTx.pm b/inc/Module/Install/RTx.pm
+index 20a354b..7e681c6 100755
+--- a/inc/Module/Install/RTx.pm
++++ b/inc/Module/Install/RTx.pm
+@@ -83,13 +83,13 @@ sub RTx {
+ if ( $RT::LocalPluginPath ) {
+ die "Because of bugs in RT 3.8.0 this extension can not be installed.\n"
+ ."Upgrade to RT 3.8.1 or newer.\n" if $RT::VERSION =~ /^3\.8\.0/;
+- $path{$_} = $RT::LocalPluginPath . "/$original_name/$_"
++ $path{$_} = '$(DESTDIR)' . $RT::LocalPluginPath . "/$original_name/$_"
+ foreach @DIRS;
+ } else {
+ foreach ( @DIRS ) {
+ no strict 'refs';
+ my $varname = "RT::Local" . ucfirst($_) . "Path";
+- $path{$_} = ${$varname} || "$RT::LocalPath/$_";
++ $path{$_} = '$(DESTDIR)' . (${$varname} || "$RT::LocalPath/$_");
+ }
+
+ $path{$_} .= "/$name" for grep $path{$_}, qw(etc po var);