private static void touchGrammarsInFolder(File folder) {
		if (folder == null) {
			return;
		}

		File[] grammars = folder.listFiles(new FileFilter() {
			public boolean accept(File pathname) {
				return pathname.isFile() && pathname.getName().endsWith(".g");
			}
		});

		long now = System.currentTimeMillis();
		for (File grammar : grammars) {
			System.out.println("Touching grammar " + grammar);
			grammar.setLastModified(now);
		}
	}