I opted to used 3.10 as it was a recent enough and available on most platforms (Ubuntu 18.04 offers 3.10).

Now after doing some searching in the CMakeLists, I think it's good to upgrade at least to 3.13.

find_package(LibXml2 REQUIRED): To have the target we are using, requires 3.12 as noted in https://cmake.org/cmake/help/latest/module/FindLibXml2.html
I make use of this CMAKE_POLICYCMP0079 introduced in 3.13. This allows me to call target_link_libraries with targets defined outside of the current CMakeLists.txt
I also make use of CMP0118, but that is introduced in 3.20. I have the workaround already in place for older versions, so we need no changes on this.

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