Script might well override a static map, but can't risk it not doing it, and preview completely failing. Better to just not try it for static maps. Some script cfg might help. Could also avoid unnnecessary preview regenerations even if the script was doing nothing at all.
find_package(SDL QUIET)
if(NOT SDL_FOUND)
find_package(SDL2 REQUIRED)
set(SDL_INCLUDE_DIR ${SDL2_INCLUDE_DIR})
set(SDL_LIBRARY ${SDL2_LIBRARY})
endif()
if(NOT SDL_VERSION)
#find which version of SDL we have
find_file(sdlversion_h SDL_version.h ${SDL_INCLUDE_DIR})
if(sdlversion_h)
file(STRINGS ${sdlversion_h} sdl_majorversion_tmp REGEX "SDL_MAJOR_VERSION[\t' ']+[0-9]+")
file(STRINGS ${sdlversion_h} sdl_minorversion_tmp REGEX "SDL_MINOR_VERSION[\t' ']+[0-9]+")
file(STRINGS ${sdlversion_h} sdl_patchversion_tmp REGEX "SDL_PATCHLEVEL[\t' ']+[0-9]+")
string(REGEX MATCH "([0-9]+)" sdl_majorversion "${sdl_majorversion_tmp}")
string(REGEX MATCH "([0-9]+)" sdl_minorversion "${sdl_minorversion_tmp}")
string(REGEX MATCH "([0-9]+)" sdl_patchversion "${sdl_patchversion_tmp}")
set(SDL_VERSION "${sdl_majorversion}.${sdl_minorversion}.${sdl_patchversion}")
endif()
endif()
mark_as_advanced(sdlversion_h sdl_majorversion sdl_minorversion sdl_patchversion)