please include function shootScreen2.

static void shootScreenAsPNGFile(File f) ctex {
  if (shootScreen_useScrot) {
    if (!isOnPATH("scrot")) shootScreen2_fallback();
    if (shootScreen_useScrot) {
      try {
        mkdirsFor(f);
        S cmd = "scrot " + bashQuote(f);
        S out = backtick(cmd);
        if (f.exists()) ret;
        shootScreen2_fallback();
      } catch e {
        print(e);
        shootScreen2_fallback();
      }
    }
  }
  savePNG(f, new Robot().createScreenCapture(screenRectangle()));
}