Problem with cmake while testing kadas albireo2 on 12.3-stable

For some reason cmake fails to find packages qwt6-qt5
and svg2svgt, though, they have both been installed.
I am not really familiar with cmake. What does it try
to do?
On the first run it stops with a complaint like this...

-- Reading /usr/local/lib/cmake/GeographicLib/geographiclib-config.cmake
-- GeographicLib configuration, version 1.52
--   ${GeographicLib_LIBRARIES} set to shared library
-- Found ZLIB: /usr/lib/libz.so (found version "1.2.11")
-- Checking for module 'qca2-qt5'
--   Found qca2-qt5, version 2.3.4
-- Checking for module 'Qt5Qwt6'
--   Package 'Qt5Qwt6', required by 'virtual:world', not found
-- Checking for module 'gdal'
--   Found gdal, version 3.4.1
-- Checking for module 'cairo'
--   Found cairo, version 1.17.4
-- Checking for module 'librsvg-2.0'
--   Found librsvg-2.0, version 2.52.5
-- Checking for module 'exiv2'
--   Found exiv2, version 0.27.5
-- Checking for module 'svg2svgt'
--   Package 'svg2svgt', required by 'virtual:world', not found
CMake Error at /usr/local/share/cmake/Modules/FindPkgConfig.cmake:603 
(message):
   A required package was not found
Call Stack (most recent call first):
   /usr/local/share/cmake/Modules/FindPkgConfig.cmake:825 
(_pkg_check_modules_internal)
   CMakeLists.txt:52 (PKG_CHECK_MODULES)


-- Configuring incomplete, errors occurred!
See also 
"/usr/ports/graphics/kadas-albireo2/work/kadas-albireo2-master/CMakeFiles/CMakeOutput.log".


If I try again the message is only marginally distinct.
The actual complaints are the same.


-- Reading /usr/local/lib/cmake/GeographicLib/geographiclib-config.cmake
-- GeographicLib configuration, version 1.52
--   ${GeographicLib_LIBRARIES} set to shared library
-- Checking for module 'Qt5Qwt6'
--   Package 'Qt5Qwt6', required by 'virtual:world', not found
-- Checking for module 'svg2svgt'
--   Package 'svg2svgt', required by 'virtual:world', not found
CMake Error at /usr/local/share/cmake/Modules/FindPkgConfig.cmake:603 
(message):
   A required package was not found
Call Stack (most recent call first):
   /usr/local/share/cmake/Modules/FindPkgConfig.cmake:825 
(_pkg_check_modules_internal)
   CMakeLists.txt:52 (PKG_CHECK_MODULES)


-- Configuring incomplete, errors occurred!
See also 
"/usr/ports/graphics/kadas-albireo2/work/kadas-albireo2-master/CMakeFiles/CMakeOutput.log".


The content of 
/usr/ports/graphics/kadas-albireo2/work/kadas-albireo2-master/CMakeFiles/CMakeOutput.log 
does not ring any bells either.


TIA
--jau