tkd - basic compilation problem

[Paul via Digitalmars-d-learn]

I downloaded the archive from 
https://github.com/nomad-software/tkd and files are same as in 
the git repo. Tcl/tk is installed on this machine (test 'hello 
world' script works fine) but I get this error when compiling the 
example from the github page:

tkd/interpreter/tcl.d(16): Error: module tcl is in file 
'tcltk/tcl.d' which cannot be read
import path[0] = /usr/include/dmd/phobos
import path[1] = /usr/include/dmd/druntime/import

As far as I can see there is no tcltk directory - can someone 
tell me where I'm going wrong or if something is missing?

TIA

Paul