cp -af system_files/* /build/cockpit-file-sharing/pkg/cockpit-file-sharing//
Installing file-sharing
Creating install directory
mkdir -p /build/cockpit-file-sharing/pkg/cockpit-file-sharing//usr/share/cockpit/file-sharing
cp: cannot stat 'system_files/*': No such file or directory
make: [Makefile:124: system-files-install] Error 1 (ignored)

Copying files
Done installing file-sharing