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With regard to libraries, then the modern and easiest approach is to use a package manager like Conan or vcpkg. These allow you to install and use multiple different versions of libraries with different options/configurations for different projects. They also integrate easily and non-invasively with your project's build system and they don't tie others to use the same setup.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.