I've updated my personal Ports tree to now be based on the official FreeBSD ports tree, with the additions needed for Aarch64 support. These changes also exist upstream in their devel branch, but no idea when they'll make another reason, so I thought to make those changes available now for FreeBSD Ports.
This has been tested against FreeBSD 13.0-RELEASE Aarch64 running under VMware ESXi ARM-Fling 1.3 (17839012) on a Raspberry Pi 4 8GB
open-vm-tools upstream just released 11.3.0 yesterday. Their upstream update contains my patch set for Aarch64 support.
I've now tested open-vm-tools on AMD64 and Aarch64. These compile, install, and run cleanly by bumping the version in the Makefile plus adding Aarch64 to ONLY_FOR_ARCHS
*** Bug 256761 has been marked as a duplicate of this bug. ***