fixed with 4.5.1, thank you demm for the quick update
the snapper KCP is broken. remove /doc as make target
/etc/makepkg.conf add: -pthread to the CXXFLAGS=" … " line
can I still trust snapper not to screw my data?
Necro-bumping 4 year old solved thread.....closing
Better change to get help by opening an issue in KCP for snapper, but seems no-one is interested or maintaining that app anymore.