FindGTK
try to find GTK (and glib) and GTKGLArea
GTK_INCLUDE_DIR - Directories to include to use GTK GTK_LIBRARIES - Files to link against to use GTK GTK_FOUND - GTK was found GTK_GL_FOUND - GTK's GL features were found
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.5/module/FindGTK.html