When compiling with sdl2 use it instead of glut for creating hidden window (as suggested by koda).
This is not tested but it should work.
message(STATUS "Performing standalone bundle creation...")
execute_process(COMMAND ls ${frameworks_dir} RESULT_VARIABLE doBundle OUTPUT_QUIET ERROR_QUIET)
execute_process(COMMAND mkdir -p ${frameworks_dir})
execute_process(COMMAND ${macdeployqt_executable} ${CMAKE_BINARY_DIR}/${bundle_name} OUTPUT_QUIET ERROR_QUIET)
if(doBundle EQUAL 1)
execute_process(COMMAND cp -pPR ${sdl_dir} ${CMAKE_BINARY_DIR}/${frameworks_dir}/SDL.framework)
execute_process(COMMAND cp -pPR ${SDLIMAGE_LIBRARY} ${CMAKE_BINARY_DIR}/${frameworks_dir}/SDL_image.framework)
execute_process(COMMAND cp -pPR ${SDLNET_LIBRARY} ${CMAKE_BINARY_DIR}/${frameworks_dir}/SDL_net.framework)
execute_process(COMMAND cp -pPR ${SDLTTF_LIBRARY} ${CMAKE_BINARY_DIR}/${frameworks_dir}/SDL_ttf.framework)
execute_process(COMMAND cp -pPR ${SDLMIXER_LIBRARY} ${CMAKE_BINARY_DIR}/${frameworks_dir}/SDL_mixer.framework)
execute_process(COMMAND cp -pPR ${OGG_LIBRARY} ${CMAKE_BINARY_DIR}/${frameworks_dir}/Ogg.framework)
execute_process(COMMAND cp -pPR ${VORBIS_LIBRARY} ${CMAKE_BINARY_DIR}/${frameworks_dir}/Vorbis.framework)
if(${SPARKLE_FOUND})
execute_process(COMMAND cp -pPR ${SPARKLE_LIBRARY} ${CMAKE_BINARY_DIR}/${frameworks_dir}/Sparkle.framework)
endif()
message(STATUS "Bundle frameworks added")
else()
message(STATUS "Bundle frameworks already present; skipping...")
endif()