It seems we finally got to the bottom of this today. There is an extra configure flag that needs to be explicitly passed when building libcurl under Ubuntu in order to end up with an appropriate version resource in the library ("--enable-versioned-symbols").

Apparently, this option defaults correctly e.g. on Centos, but not on Ubuntu. We found this by finally reading the official Debian package script for libcurl (after noticing that the officially distributed libcurl library did have the correct resource), and noticing the explicit passing of this flag there.

Noted here for future reference, in case anybody else runs into this issue (there seems to be a lot of confusion and poor advice about this out on the web). Please feel free to close this issue!

thanks much,
--FritzM.

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