diff --git a/CMakeExternals/GLUTCMakeLists.txt b/CMakeExternals/GLUTCMakeLists.txt
index 963da1d66d..491c7e5bdd 100644
--- a/CMakeExternals/GLUTCMakeLists.txt
+++ b/CMakeExternals/GLUTCMakeLists.txt
@@ -1,77 +1,85 @@
 cmake_minimum_required(VERSION 2.8.4)
 
 project(GLUT)
 
 set(${PROJECT_NAME}_MAJOR_VERSION 2)
 set(${PROJECT_NAME}_MINOR_VERSION 8)
 set(${PROJECT_NAME}_PATCH_VERSION 1)
 set(${PROJECT_NAME}_VERSION ${${PROJECT_NAME}_MAJOR_VERSION}.${${PROJECT_NAME}_MINOR_VERSION}.${${PROJECT_NAME}_PATCH_VERSION})
 
 find_package(OpenGL REQUIRED)
 
 include_directories(${OPENGL_INCLUDE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/include)
 if(NOT BUILD_SHARED_LIBS)
   add_definitions(-DFREEGLUT_STATIC)
 endif()
 
 set(freeglut_HEADERS
   include/GL/freeglut.h
   include/GL/freeglut_ext.h
   include/GL/freeglut_std.h
   include/GL/glut.h
   src/freeglut_internal.h
   src/freeglut_teapot_data.h
 )
 
 set(freeglut_SOURCES
   src/freeglut_cursor.c
   src/freeglut_display.c
   src/freeglut_ext.c
   src/freeglut_font.c
   src/freeglut_font_data.c
   src/freeglut_gamemode.c
   src/freeglut_geometry.c
   src/freeglut_glutfont_definitions.c
   src/freeglut_init.c
   src/freeglut_input_devices.c
   src/freeglut_joystick.c
   src/freeglut_main.c
   src/freeglut_menu.c
   src/freeglut_misc.c
   src/freeglut_overlay.c
   src/freeglut_spaceball.c
   src/freeglut_state.c
   src/freeglut_stroke_mono_roman.c
   src/freeglut_stroke_roman.c
   src/freeglut_structure.c
   src/freeglut_teapot.c
   src/freeglut_videoresize.c
   src/freeglut_window.c
 )
 
 if(MSVC)
   list(APPEND freeglut_SOURCES src/freeglut_callbacks.c)
 elseif(UNIX)
   list(APPEND freeglut_SOURCES src/freeglut_xinput.c)
 endif()
 
+if(UNIX AND NOT APPLE)
+  add_definitions(
+    -DHAVE_SYS_IOCTL_H
+    -DHAVE_FCNTL_H
+    -DHAVE_ERRNO_H
+  )
+endif()
+
 add_library(freeglut ${freeglut_HEADERS} ${freeglut_SOURCES})
 target_link_libraries(freeglut ${OPENGL_gl_LIBRARY} ${OPENGL_glu_LIBRARY})
 set_target_properties(freeglut PROPERTIES
                       DEFINE_SYMBOL FREEGLUT_EXPORTS
                       SOVERSION ${${PROJECT_NAME}_VERSION})
 
 # Config files
 set(${PROJECT_NAME}_LIBRARIES freeglut)
 set(${PROJECT_NAME}_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/include)
 
 configure_file(${PROJECT_NAME}Config.cmake.in
                ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake @ONLY)
 export(TARGETS ${${PROJECT_NAME}_LIBRARIES} FILE ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Exports.cmake)
 
 # Version information
 configure_file(
   ${CMAKE_CURRENT_SOURCE_DIR}/${PROJECT_NAME}ConfigVersion.cmake.in
   ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
   @ONLY
 )