By using libcurl. I run a distributed c++ database and it's one of the most stable components of our stack. Java and Ruby tend to break much more often. Also, you wouldn't want to use Python without any packages, so why insist on the same with c++?
As others have pointed out, CMake is the de facto standard in C++. However, a combination of CMake with Conan seems to take care of most of anyone's needs. The downside is that the availability of C++ packages in Conan tends to be very limited.
[1]: https://github.com/microsoft/vcpkg [2]: https://conan.io [3]: https://github.com/cpp-pm/hunter