The only target accessible via Bazel (@com_github_google_glog//:glog) no longer provides any headers, due to PR ##488. This breaks when using features = ["layering_check"]. Given the low-level nature of logging libraries and pervasive dependencies in a code base which uses them, it's infeasible to disable that feature for just the targets which depend on glog. The benefits afford by the check (particularly for code bases which are imported internally) means that disabling it for our entire code base isn't reasonable.