Find wish installation
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:
TK_WISH = the path to the wish executable
if UNIX is defined, then it will look for the cygwin version first
© 2000–2020 Kitware, Inc. and Contributors
Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/module/FindWish.html