Well, I don’t think so.  I mean, I believe I’ve followed the steps in that link.  To be sure, I went through it again and made a new project directory with minimal code. I still get the same error:
terminate called after throwing an instance of 'torch::jit::ErrorReport'
  what():  
Unknown builtin op: torchvision::nms.
Could not find any similar ops to torchvision::nms. This op may not exist or may not be currently supported in TorchScript.
:
  File "/usr/local/lib64/python3.6/site-packages/torchvision-0.11.0a0+a2b4c65-py3.6-linux-x86_64.egg/torchvision/ops/boxes.py", line 35
    """
    _assert_has_ops()
    return torch.ops.torchvision.nms(boxes, scores, iou_threshold)
           ~~~~~~~~~~~~~~~~~~~~~~~~~ <--- HERE

My CMakeLists.txt looks like this:
cmake_minimum_required(VERSION 3.10)
project(testTorch)

# The first thing do is to tell cmake to find the TorchVision library.
# The package pulls in all the necessary torch libraries,
# so there is no need to also add `find_package(Torch)` here.
find_package(TorchVision REQUIRED)

add_executable(testTorch main.cpp)

include_directories(testTorch ${OpenCV_INCLUDE_DIRS})

# We now need to link the TorchVision library to our executable.
# We can do that by using the TorchVision::TorchVision target,
# which also adds all the necessary torch dependencies.
target_compile_features(testTorch PUBLIC cxx_range_for)
target_link_libraries(testTorch TorchVision::TorchVision)
set_property(TARGET testTorch PROPERTY CXX_STANDARD 14)

I hope I’m not missing something obvious here, I tried many things before posting the question.  Any help would be appreciated…