if(HAVE_GL)
  # Check that we actually have a display subsystem.
  if(NOT HAVE_WGL AND NOT HAVE_COCOA AND NOT HAVE_CARBON AND NOT HAVE_GLX)
    message("") # Add extra line before error
    message(SEND_ERROR
      "When compiling with OpenGL (HAVE_GL), at least one of:
    HAVE_WGL, HAVE_COCOA, HAVE_CARBON, or HAVE_GLX must be defined.")
  endif()

  set(PANDAGL_LINK_TARGETS p3glgsg p3glstuff)

  if(HAVE_GLX)
    list(APPEND PANDAGL_LINK_TARGETS p3glxdisplay p3x11display)
  endif()

  if(HAVE_WGL)
    list(APPEND PANDAGL_LINK_TARGETS p3wgldisplay p3windisplay)
  endif()

  if(HAVE_COCOA)
    list(APPEND PANDAGL_LINK_TARGETS p3cocoadisplay)
  endif()

  if(HAVE_CARBON)
    list(APPEND PANDAGL_LINK_TARGETS p3osxdisplay)
  endif()

  add_metalib(pandagl ${MODULE_TYPE} pandagl.cxx COMPONENTS ${PANDAGL_LINK_TARGETS})
  set_target_properties(pandagl PROPERTIES DEFINE_SYMBOL BUILDING_PANDAGL)

  install(TARGETS pandagl DESTINATION ${MODULE_DESTINATION})
endif()