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It would be nice if the README would mention how this compares to cmake's builtin ExternalProject module, which at first glance offers similar functionality (https://cmake.org/cmake/help/v3.5/module/ExternalProject.htm...)

I don't think ExternalProject manages the packages. For example, cget won't install the package again if its already installed.

ExternalProject is for the build itself to pull down dependencies, this looks more end-user (or end-dev) orientated