Thanks for this! However, I'm unable to get this working, let me know if you'd rather I post this as a github issue:

MacBook Pro 13" with 10.7.5 Droid Razr with Android 4.0.4 Verizon with mobile hotspot and I believe I had tethering working on a Windows laptop before.

Steps: I have installed HoRNDIS and rebooted (tried install/reboot again just to be sure) Plugged in my phone via USB Enabled USB tethering and it says tethering error There are no changes in the Network preferences on the Mac

Saw it wasn't loaded so I manually loaded it:

sudo kextload /System/Library/Extensions/HoRNDIS.kext

Tried to tether again and noticed these errors in kernel.log:

  Nov 14 19:05:28 Robs-MacBook-Pro kernel[0]: 0        1 AppleUSBCDCACMData: start - Find CDC driver for ACM data interface failed
  Nov 14 19:05:28 Robs-MacBook-Pro kernel[0]: 0        1 AppleUSBCDCECMData: start - Find CDC driver for ECM data interface failed