Install under a prefix (requires root for typical prefixes). Use the CMake helper to configure, build, and install the module:

scripts/cmake.configure.zsh --install-system --prefix /usr/local

Add the installed module directory to your module_path (default path shown):

module_path+=(/usr/local/lib/zsh/site-modules)

zmodload -i zpmod

Keep the module early in ~/.zshrc to profile all subsequent sourcing.

Notes:

The helper delegates to CMake; set variables like ZPMOD_ZSH_MODDIR with -D flags if needed.
For local testing, cmake --build build-cmake --target stage installs to a staged tree under build-cmake/stage used by the test suite.