I'm sure that the specific tcl/tk module is missing.

If you are running ActivePerl , it comes with "style" ( see Tcl::tkkit ).

If you compiled Tcl.pm yourself, well, now you have to manage your tcl install yourself.

If you installed ActiveTcl this means running teacup, its the ppm equivalent of the tcl world.

Otherwise, you need to seek help from tcl/tk/debian folk :)