In order for you to play Avernum: Escape From the Pit on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
OS X 10.5 or later
Processor (CPU):
1.6 GHz
Memory (RAM):
256 MB RAM, 512 MB Recommended
Hard Disk Space:
300 MB
Video Card:
3D accelerated graphics card, Open GL compliant