Index: example/CMakeLists.txt
--- example/CMakeLists.txt.orig
+++ example/CMakeLists.txt
@@ -9,6 +9,8 @@ find_package(GLUT REQUIRED)
 
 target_include_directories(opencsgexample PRIVATE
     "${CMAKE_SOURCE_DIR}/include"
+    "${OPENGL_INCLUDE_DIRS}"
+    "${GLUT_INCLUDE_DIRS}"
 )
 
 target_link_libraries(opencsgexample PRIVATE
