As a standalone package you can just run:

git clone --recurse-submodules https://github.com/Axi5/odin-kdl.git

To add to existing projects I recommend including this as a git submodule:

git submodule add https://github.com/Axi5/odin-kdl.git
git submodule update --init --recursive

You can build the ckdl binaries yourself following the instructions over at their documentation page. However this repo includes an odin build script that calls the CMake commands for you, just run:

odin run ./_build

To build debug binaries add -define:CONFIGURATION=Debug, this is set to Release by default. To build statically add -define:SHARED_LIB=OFF

Once complete the package should contain the artifacts, a lib file in root if built statically, or dynamic libraries in bin/Release.

You should now be able to import "kdl" in odin and use it, be sure to copy the shared library to your executable folder.