Find tclsh
This module finds if TCL is installed and determines where the include files and libraries are. It also determines what the name of the library is. This code sets the following variables:
TCLSH_FOUND = TRUE if tclsh has been found TCL_TCLSH = the path to the tclsh executable
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/module/FindTclsh.html