A point made at <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=6360232" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=6360232</a> is that it suffices to use an older compiler and system, assuming that the newer one was developed independently.