Install to a Custom Directory

Use the CMake helper with a custom prefix or install subdir:

# Install under a custom prefix
scripts/cmake.configure.zsh --install-system --prefix /opt
 
# Or stage locally, then copy the artifact where you want
scripts/cmake.configure.zsh
cp build-cmake/stage/lib/zsh/site-modules/zpmod.so /opt/zpmod/

Then add to ~/.zshrc:

module_path+=(/opt/zpmod)
zmodload -i zpmod

If you later update, rerun with the same --target path.