Changed all GL-related INCLUDE_DIRS to INCLUDE_DIR

Fixes #320

Signed-off-by: Benn Snyder <[email protected]>

Author: piedar

examples/CMakeLists.txt

@@ -56,7 +56,7 @@ else()
   find_package(OpenGL REQUIRED)
   find_package(GLUT REQUIRED)
 
-  include_directories(${OPENGL_INCLUDE_DIRS} ${GLUT_INCLUDE_DIR} ${USB_INCLUDE_DIRS})
+  include_directories(${OPENGL_INCLUDE_DIR} ${GLUT_INCLUDE_DIR} ${USB_INCLUDE_DIRS})
 
   target_link_libraries(glview freenect ${OPENGL_LIBRARIES} ${GLUT_LIBRARY} ${CMAKE_THREAD_LIBS_INIT} ${MATH_LIB})
   target_link_libraries(regview freenect ${OPENGL_LIBRARIES} ${GLUT_LIBRARY} ${CMAKE_THREAD_LIBS_INIT} ${MATH_LIB})

wrappers/cpp/CMakeLists.txt

@@ -25,7 +25,7 @@ else()
   find_package(OpenGL REQUIRED)
   find_package(GLUT REQUIRED)
 
-  include_directories(${OPENGL_INCLUDE_DIRS} ${GLUT_INCLUDE_DIRS} ${USB_INCLUDE_DIRS})
+  include_directories(${OPENGL_INCLUDE_DIR} ${GLUT_INCLUDE_DIR} ${USB_INCLUDE_DIRS})
 
   target_link_libraries(cppview freenect ${OPENGL_LIBRARIES} ${GLUT_LIBRARY} ${CMAKE_THREAD_LIBS_INIT} ${MATH_LIB})
 endif()