Yes, this will be my backup plan.

However, I was able to get the module successfully installed and working on my development machine (Mac-Mini). Hmmm...

A search for the missing windows 10 library reveals the following on the Mac (with checksums):

54918 702 ~/.cpan/build/Compress-Zstd-0.20-0/ext/zstd/lib/libzstd.a
14207 788 ~/.cpan/build/Compress-Stream-Zstd-0.206-0/ext/zstd/lib/obj/
+conf_bd2d977386eb0c0c4c6c1128107e0a49/static/libzstd.a
14207 788 ~/.cpan/build/Compress-Stream-Zstd-0.206-0/ext/zstd/lib/libz
+std.a
47868 821 /opt/homebrew/Cellar/zstd/1.5.2/lib/libzstd.a
[download]

Clearly I first used homebrew to download the zstd command, but I don't know if CPAN was smart enough to find libzstd.a there and use that one. Since the checksums are different I'm guessing that CPAN built its own libzstd.a.

So then why didn't windows build its own libzstd.a as well??