> I actually extremely dislike language specific package managers. I'm on Linux, the packages should be in my package manager. I don't want to maintain multiple package managers. nmp is actually the worst here.

As a user of software that doesn't care how it's built, sure. But system package managers are not a solution for general development with C++, or any other language.

If I want to use C or C++ to create software, how do I use libraries that aren't available in a system package manager? What if I need a version of a library that's not available in my system package manager? There are answers here but they aren't good answers (build from source, using whichever of N build tools the project happens to use, or hope there are prebuilt libs hosted somewhere)

Relying on system package managers to contain dependent libraries makes cross-platform development a complete PITA (more that it already is). Now you need the specific versions of all your libraries in package managers on all platforms, which is a complete non-solution for real development.