Your system package manager, usually, along with something to detect/configure dependencies (autotools, CMake, etc). CMake can be set up to automatically downlo

Your system package manager, usually, along with something to detect/configure dependencies (autotools, CMake, etc). CMake can be set up to automatically download missing dependencies in some cases, too, and I think there are some other build systems that provide this sort of functionality. But there's not some standard packaging system a la pip or cargo or the like.