There is a reason Plan 9 dumped PoSix, there is APE ( http://doc.cat-v.org/plan_9/4th_edition/papers/ape http://doc.cat-v.org/plan_9/4th_edition/papers/ape ) bu

There is a reason Plan 9 dumped PoSix, there is APE ( http://doc.cat-v.org/plan_9/4th_edition/papers/ape http://doc.cat-v.org/plan_9/4th_edition/papers/ape ) but to properly maintain it would take way more effort than the rest of the OS. And it is becoming even worse, 'all the world is a vax' has become 'all cpus are x86(-64), all the kernels are linux, all the libcs are glibc, and all the compilers are gcc', portability of most software is awful, and auto*hell only makes things much worse.