Hi,
the Tcl::Tk requires snit package to be in Tcl/Tk installation for
scrolled windows support. Snit is a part of 'tcllib'
If you have ActiveTCL, use teapot to install snit.
Or just download snit from tcllib repository (see
http://wiki.tcl.tk/3963 and
http://wiki.tcl.tk/1246)
ActivePerl has snit within its tkkit.dll
So Tcl::Tk should either go with snit embedded into distribution, or
detect and report in Makefile.PL time.