[CMake] Language Dependency for TCL?

[hex]

hello,

I am setting up a TCL project so I disabled all language variables:

*cmake_minimum_required(VERSION 2.4)**
**
**project(P LANGUAGES NONE)**
**find_package(TCL)*


however, this fails with

*-- Could NOT find TCL (missing: TCL_LIBRARY) **
**-- Could NOT find TCLTK (missing: TCL_LIBRARY TK_LIBRARY) **
**-- Could NOT find TK (missing: TK_LIBRARY) *


If I instead add languages to the project the TCL package works. This 
makes me wonder what dependencies TCL has with standard languages. Is 
the package incomplete? Why do I need to use a language that I do not 
intend to use?

for example:

*cmake_minimum_required(VERSION 2.4)**
**
**project(P LANGUAGES C)**
**find_package(TCL)**
*

*-- Found Tclsh: /usr/bin/tclsh (found version "8.6") **
**-- Found TCL: /usr/lib/x86_64-linux-gnu/libtcl.so **
**-- Found TCLTK: /usr/lib/x86_64-linux-gnu/libtcl.so **
**-- Found TK: /usr/lib/x86_64-linux-gnu/libtk.so *


thank you

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