TL;DR: Run '
sudo apt install libappindicator3-1' (assuming glinux/debian/ubuntu) to ensure you have the required package installed.
Previously, we would opportunistically dlopen libappindicator if available, and use it under certain circumstances. We have now changed to using it all the time, and therefore require the package to be installed. The easiest way to make sure the library is installed, is simply to try to install it again. Assuming you are running a debian based system, run:
sudo apt install libappindicator3-1
If you are doing GTK+2 builds (instead of the default GTK+3), then you need to install libappindicator1 instead (or you can install both).
Let me know if you have any questions,
Tim