Qemu is ridiculously easy to compile on every Linux. Really. Just git clone, ./configure && make. The number of dependencies is tiny.

It's also available in every Linux & *BSD distro of significance as a binary.

It's also pretty easy to compile on Windows, although of course Windows lacks a compiler out of the box, but that's entirely the fault of Windows.

QEMU is configured at compile time (with arguments to ./configure). It does not make sense to make a one-size-fits-all binary.

Grabbing the source from git and compiling it takes only a moment anyway.