syncevolution dependency
Just a placeholder for this.
For that we should just reintroduce syncevolution (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=935239) and build without kde support.
There is an ITP to reintroduce syncevoltion
but it is stale: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=939028
I posted there, but I need sometime to dig into that (building syncevolution without KDE).
/cc @guido.gunther