cmake HAVE_GL_GLU_H examples

InsightSoftwareConsortium/ITK Modules/ThirdParty/TIFF/src/itktiff/cmake/OpenGLChecks.cmake :45 

check_include_file(GL/glu.h HAVE_GL_GLU_H)

Ravbug/UnityHubNative wxWidgets/src/tiff/cmake/OpenGLChecks.cmake :40 

check_include_file(GL/glu.h HAVE_GL_GLU_H)

Froser/gamemachine src/3rdparty/libtiff/CMakeLists.txt :597 

check_include_file(GL/glu.h HAVE_GL_GLU_H)

fligger/FateInjector wxWidgets-3.2.0/src/tiff/CMakeLists.txt :614 

check_include_file(GL/glu.h HAVE_GL_GLU_H)