After

[ponchale@easyas build]$ cmake -DCMAKE_INSTALL_PREFIX=$KF5 -DCMAKE_PREFIX_PATH=$KF5 ..
--

CMake Error at /usr/share/ECM/modules/ECMPackageConfigHelpers.cmake:95 (file):
  file RELATIVE_PATH must be passed a full path to the file:
Call Stack (most recent call first):
  CMakeLists.txt:45 (ecm_configure_package_config_file)


--
-- The following REQUIRED packages have been found:

 * ECM (required version >= 5.19.0) , Extra CMake Modules. , <https://projects.kde.org/projects/kdesupport/extra-cmake-modules>
 * Qt5Core (required version >= 5.5.1)
 * Qt5Gui (required version >= 5.5.1)
 * Qt5Widgets
 * Qt5UiPlugin (required version >= 5.5.1)
 * Qt5UiTools
 * Qt5Test
 * Qt5 (required version >= 5.3.0)

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