cmake OIS examples

gazebosim/gazebo-classic gazebo/rendering/skyx/CMake/SkyXDependencies.cmake :77 

find_package(OIS)

RigsOfRods/rigs-of-rods cmake/DependenciesConfig.cmake :9 

find_package(OIS REQUIRED)

qwertzui11/voxelTerrain CMakeLists.txt :119 

find_package(OIS REQUIRED)