I write a lot of CL, and it’s reasonably easy to write standard-conforming code that just works across multiple implementations and, if you need something not s

I write a lot of CL, and it’s reasonably easy to write standard-conforming code that just works across multiple implementations and, if you need something not standardized like sockets, TLS, or threads, there are fairly high-quality and “standard” portability libraries that make it easy to avoid reader conditionals most of the time.