CHECK_C_SOURCE_COMPILES("
  ${AVFILTER_INC}
  int main(int argc, char *argv[])
  { 
    static AVFilterBufferRefVideoProps test;
    if(sizeof(test.sample_aspect_ratio))
      return 0;
    return 0;
  }
"
HAVE_AVFILTERBUFFERREFVIDEOPROPS_SAMPLE_ASPECT_RATIO)