instructions are not working for Qt 5.12.8 and cmake 3.16.3 on Kubuntu 20.04

[GitZesty]

When I run the cmake command, I get an error.

cmake -DCMAKE_BUILD_TYPE=Release ..
-- The C compiler identification is GNU 9.3.0
-- The CXX compiler identification is GNU 9.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Could NOT find ECM (missing: ECM_DIR)
-- 
 * ECM (required version >= 5.70.0), Extra CMake Modules., <https://commits.kde.org/extra-cmake-modules>

CMake Error at /usr/share/cmake-3.16/Modules/FeatureSummary.cmake:457 (message):
  feature_summary() Error: REQUIRED package(s) are missing, aborting CMake
  run.
Call Stack (most recent call first):
  CMakeLists.txt:10 (feature_summary)

kernel version is 5.4.0-91

[GitZesty]

Oh, I just noticed that the requirements are Qt 5.14, so I guess you can cancel this issue.