@hy: thank you very much for your advice ! Tried to follow the instructions. This is what happened:

a) after recompiling (I just deleted every file within ~/Projects/build/indi-core and ran the cmake, etc. again (do I actually have to do this or can I just run the cmake, etc. without deleting the files beforehand ?) my indi_skywatcherAltAzMount binary still stands at 584k vs 90k in the "orignal Stellarmate" installation. Why is this ? It is not that I changed / added much code, it was just minor changes.

b) the "sudo apt install libavcodec-dev libavutil-dev libgphoto2-dev libdc1394-dev libgps-dev" ended with an error message "unable to locate package: libdc1394-dev". I removed this package from the command and the remaining packages have been installed

c) after the "cmake -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Debug -DBUILD_LIBS=1 ~/Projects/indi-3rdparty" I received another error message: CMake Error at cmake_modules/FindFTDI1.cmake:50 (message): FTDI not found. Please install libftdi1-dev

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