Where to store open source license for a dependency where the dependency is not directly stored in the repository?

I have a c++ project where I have built a small utility that will read a JSON file where all the dependencies are defined and download them from the provided URLs, build them using CMake, and install them to vendor/ directory. This directory only exists locally. I typically work with MIT projects but there is this project (Freetype) which uses a derivative of BSD license and requires license file to be stored with the source code. However, since I am not storing the library with source code, where do I need to store these license files?