Compatibility with versions prior to 2.8.12 is being deprecated,
resulting in build warning messages. The minimum for the official
supported distros is 3.7.2 (Stretch), so the version could be moved
forward when newer features are required.
Reference: https://cmake.org/cmake/help/v3.19/release/3.19.html#deprecated-and-removed-features
The plugin shipped with Qt has the sqlite symbols set to hidden. It seems dlsym() actually cares about that on Snow Leopard whereas it doesn't in Leopard.
If it can't find the sqlite functions in the given library, then it will go fishing and find /usr/lib/libsqlite3.dylib and that's bad :-(