Gets through configure, but then fails with

ninja: error: '/scratch/wip/netdata/work/netdata-2.8.3/src/aclk/aclk-schemas/proto/aclk/v1/lib.proto', needed by 'src/aclk/aclk-schemas/proto/aclk/v1/lib.pb.cc', missing and no known rule to make it

/scratch/wip/netdata/work/netdata-2.8.3/src/aclk/aclk-schemas/ is an empty directory.
