tkd not linking

[karabuta via Digitalmars-d-learn]

I have tried several times to compile tkd using dub but I keep 
getting this message:

Linking...
/usr/bin/ld: cannot find -ltcl
/usr/bin/ld: cannot find -ltk
collect2: error: ld returned 1 exit status
--- errorlevel 1
FAIL 
.dub/build/application-debug-linux.posix-x86-dmd_2068-4989C12BA459945625492BF92EAC638A/ tkdapps executable
Error executing command run:
dmd failed with exit code 1.


I use Ubuntu 14.04 x32. Here is the dub.json file content

{
	"name": "tkdapps",
	"description": "A minimal D application.",
	"copyright": "Copyright © 2015, karabuta",
	"authors": ["karabuta"],
	"dependencies": {
		"tcltk": "8.6.5",
		"tkd": "1.1.4"
	}
}

Just incase, I have install version 8.6 of the Tcl/Tk libraries

What is the problem. And how is tcltk different from tkd in the 
first place?