Had a working version of privoxy 3.0.21 running fine on a laptop with Mac OS 10.8.5.
I upgraded the laptop today to 10.9 Mavericks. After reboot, I see that privoxy hasn't loaded. Used launchctl to unload and reload the .plist file in /Library/LaunchDaemons. Still wound't start.
Next I tried downloading a fresh copy from here (3.0.21 64 bit). Ran installer. Installer failed. I've attached the installer logs below.