> I'm somewhat lost about how even manually address the problem. Should > clang-9.0 use /opt/local/libexec/libcxx-bootstrap/lib/libxml2.2.dylib?
I have wrestled with this a few times as well. I believe, in the end, I solved it by deactivating clang-5+ (and xar?), and rebuilding libxml2 with clang-3.4, which seemed immune. But it was a bit trial-and-error and I never did write the process down, much less sort out how it might be automated. Ken