Find Ruby
This module finds if Ruby is installed and determines where the include files and libraries are. Ruby 1.8, 1.9, 2.0 and 2.1 are supported.
The minimum required version of Ruby can be specified using the standard syntax, e.g. find_package(Ruby 1.8)
It also determines what the name of the library is. This code sets the following variables:
RUBY_EXECUTABLE
RUBY_INCLUDE_DIRS
RUBY_LIBRARY
RUBY_VERSION
RUBY_FOUND
Also:
RUBY_INCLUDE_PATH
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.12/module/FindRuby.html