svoid makeWriteableForAll(File file) ctex {
  if (!isWindows())
    try {
      makeWriteableForAll_java7(file);
    } catch {
      warn("Java 6 fallback for makeWriteableForAllW");
      backtick("chmod a+rw " + bashQuote(file));
    }
}

Began life as a copy of #1001504