Extra modules and scripts for CMake.
Extra CMake Modules, or ECM, aims to augment CMake with additional modules. It serves as both a staging ground for new modules before they are moved upstream to CMake and a place for modules that, for whatever reason, are not a good fit for CMake itself.
To install kde-extra-cmake-modules-devel, paste this in macOS terminal after installing MacPorts
sudo port install kde-extra-cmake-modules-devel