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

© 2000–2017 Kitware, Inc. and Contributors
Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.7/module/FindGTK.html