It's stated as a non-goal simply because it's not the most valuable thing I can do with my time. My fundamental stance is that writing new Windows or Linux or macOS or WASM programs in C is a good idea, and those are the programs that I write, so that's where my focus is. But if someone would like to come along and write the ~30 syscalls needed to port the library to a new platform, or even register any interest in such, I'd be happy to look into it at that point.