Build Ping Viewer from source Jetson Xavier

Getting further, every step has an obstacle to overcome
Hopefully almost there, been at this for weeks!

urop@urop-Jetson-Xavier-desktop:~/ping-viewer$ cmake -B build -DCMAKE_BUILD_TYPE=Debug -DCMAKE_PREFIX_PATH=/usr/local/Qt-5.15.0/
-- Compiler information:
--  Compiler ID: GNU
--  Compiler Version: 7.5.0
-- Version: 6.1.1
-- Build type: Debug
-- CXX_STANDARD: 17
-- Configuring done
-- Generating done
-- Build files have been written to: /home/urop/ping-viewer
urop@urop-Jetson-Xavier-desktop:~/ping-viewer$ cmake --build build --parallel --config Debug
Error: could not load cache

It seems to have built but cant do the next step or run it yet