Before

[ponchale@easyas build]$ cmake -DCMAKE_INSTALL_PREFIX=$KF5 -DCMAKE_PREFIX_PATH=$KF5 ..
CMake Warning at CMakeLists.txt:6 (find_package):
  Could not find a configuration file for package "ECM" that is compatible
  with requested version "5.20.0".

  The following configuration files were considered but not accepted:

    /usr/share/ECM/cmake/ECMConfig.cmake, version: 5.19.0



--
 * ECM (required version >= 5.20.0) , Extra CMake Modules. , <https://projects.kde.org/projects/kdesupport/extra-cmake-modules>

CMake Error at /usr/share/cmake-3.5/Modules/FeatureSummary.cmake:556 (message):
  feature_summary() Error: REQUIRED package(s) are missing, aborting CMake
  run.
Call Stack (most recent call first):
  CMakeLists.txt:8 (feature_summary)


-- Configuring incomplete, errors occurred!
See also "/home/ponchale/kwidgetsaddons/build/CMakeFiles/CMakeOutput.log".