only want to start - TK programming in D with one code example. Linkingerror.

[MHE]

Hi there,
i am completely new in D Programming and only want to start the 
example code for TK that is described on the homepage 
https://github.com/nomad-software/tkd.
For this i have gitcloned the 3 packages tcltk tkd x11 in the 
folder /usr/local/GIT/.
Then i run the command dub inside any single folder and build it.

When i want to run the example TK D script the following results 
are seen -

$ dmd -I/usr/local/GIT/ hw_graphical2.d
hw_graphical2.d(1): Error: module tkdapplication is in file 
'tkd/tkdapplication.d' which cannot be read
import path[0] = /usr/local/GIT/
import path[1] = /usr/include/dmd/phobos
import path[2] = /usr/include/dmd/druntime/import
hans at mx1:~/Documents/D_lang
$

I have made something wrong with the configuration of the TKD 
module.
Need help here to start programming with D and TK.

WBR
MHE