Ensure Owl works on more systems

[bugaevc]

• old OS X (re-ensure)
• Hurd (re-ensure)
• GNU/Linux
• BSD

[barracuda156]

@bugaevc Is it known what is the earliest macOS version this can work on? Any chance of it building for 10.5–10.6? Primary interest is PowerPC, but I think the arch is not a big issue, while SDK might be.

[bugaevc]

10.6 was my original target for Owl indeed. It would be great if you get it working on PowerPC and/or 10.5.

[barracuda156]

@bugaevc Thank you for responding!

If it worked on 10.6.8 Intel, chances are high it will work at least on 10.6 ppc (likely 10.5.8 too, but depends what SDK features are being used).

I will try building it and let you know.