did another run now with the geehalel indi branch:
prior to the compilation I could connect to my mount via direct USB @115k. After the compilation I could not connect with either skywatcher_altaz, Altaz_simple or EQmod.
For the EQmod I received the following log message:
[2020-09-11T13:45:25.870 CEST INFO ][ org.kde.kstars.indi] - EQMod Mount : "[ERROR] Error: Communication failed -> tty write failed, check connection: Write Error: Bad file descriptor "
[2020-09-11T13:45:25.872 CEST DEBG ][ org.kde.kstars.ekos] - "EQMod Mount" is disconnected.
[2020-09-11T13:45:25.873 CEST INFO ][ org.kde.kstars.ekos] - "EQMod Mount is disconnected."
For the other two, I attach the log file. It occurs to me, that for the skywatcher_altaz the config.xml in the .indi directory is missing. I could set the connection parameters in the indi control panel, but I am unsure whether they have any effect: