Paths are hardcoded to reference rt3 directory structure. To support rt4, apply this patch:
[jfiske@otto ~]$ diff inc/Module/Install/RTx.pm inc/Module/Install/RTx.pm.orig
47c47
< map { ( "$_/rt4/lib", "$_/lib/rt4", "$_/lib" ) } grep $_,
---
Show quoted text
> map { ( "$_/rt3/lib", "$_/lib/rt3", "$_/lib" ) } grep $_,
54c54
< push @INC, $_, "$_/rt4/lib", "$_/lib/rt4", "$_/lib";
---
Show quoted text> push @INC, $_, "$_/rt3/lib", "$_/lib/rt3", "$_/lib";