Add unistd.h header for sysconf() on OpenBSD

You should fix it for all systems and not only for OpenBSD i.e. it should be like this.

Also as far I understand <sys/param.h> is not really needed for AltiVec detection on OpenBSD and includes of <sys/sysctl.h> can be unified like this. Can you check this?

I was only touching the OpenBSD specific path as that's the only OS I deal with and aware of any build issue at the moment, but that first diff does look more appropriate.

I don't know why sys/param.h is there, but I don't believe it is necessary either. sys/param.h includes sys/types.h so it was probably used with the intention of ultimately including sys/types.h. machine/cpu.h is there for CPU_ALTIVEC. That looks more appropriate.

mentioned in issue #45 (closed)

I have created alternative MR !97 (merged) with this patches.

Ok. I will close this.

closed