@istvan
Yeah, supporting 10.4 would definitely be a challenge, I've attempted building Apple's own dtrace tools, which work fine in 10.5, for 10.4 — only to realize that some kernel interfaces are simply not there 😂
MorphOS is at least maintained — so nothing is impossible now that Rust itself more or less stabilised, but it would still be a challenge to port it.
MUSL Linux on 32-bit PowerPC is a rare platform, but nowhere near these two.