Tcl/Tk-shell pgtksh for NT and/or the Mac

Is there an easy way to get a postgres aware pgtksh (wish,
Tcl/Tk-shell) for NT and/or the Mac.

Am I right, that pgtksh will allow to run pgtksh scripts unmodified
across the platforms?

I love Tcl/Tk and the paragraph below (taken from
http://www.postgresql.org/info.shtml) sounds so promising, but I
didn't find a pointer to a pgtksh port yet.

---------
     PostgreSQL has TCL/TK library in distribution. TCL/TK is a Rapid
     Application Development tool. Develop once and run it everywhere on
     NT, Win 95, Linux, and most Unixes!
---------

Thanks for any hints,
        sebastian
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