To make this work, I created a symlink to the existing zlib.BUILD file.
Maybe there is a better way to do this, but this is at least a quick
workaround to fix the build.

To make this work, I created a symlink to the existing zlib.BUILD file.
Maybe there is a better way to do this, but this is at least a quick
workaround to fix the build.

@bazel_skylib//:lib is supposedly deprecated. The 'versions' struct in lib.bzl was committed to bazel-skylib at the same time as //lib:versions.bzl, so there should be no backward incompatibility.

The example utilizes native bazel rules (proto_library, cc_proto_library,
java_proto_library, java_lite_proto_library) to show how easy it is to
build protobuf with bazel's native support. It also makes use of well
known types which was not possible until the latest bazel 0.5.4 release
and https://github.com/google/protobuf/pull/3594 .