Recompiled v2.3.6 sources in fat-binary mode (Xcode 3.2.6, SDK 10.6, Target OS X 10.6). Fully supported in 32bit and/or 64bit mode under all OS X/macOS versions from Mac OS X Snow Leopard 10.6 to macOS Catalina 10.15.
Tested on Dell Latitude D630 and D830, both fitted with Broadcom BCM5755M Gigabit Ethernet cards (14e4:1673).
Nov 16th, 2018: updated description to confirm support up to macOS Mojave 10.14
Jan 11th, 2019: updated description to confirm support up to macOS Catalina 10.15