tensorflow - tensorflow bazel 构建失败 - 没有这样的包'@protobuf//'

Question

即使我安装了 protobuf (2.6.1) 并成功测试了它的示例，当我在 ubuntu 14.04 上构建 tensorflow (0.9) 时出现以下错误。有什么想法吗？

# bazel build -c opt --config=cuda //tensorflow/cc:tutorials_example_trainer
ERROR: /usr/local/tensorflow/tensorflow/cc/BUILD:61:1: error loading package 
'tensorflow/core': Encountered error while reading extension file 'protobuf.bzl': no such package '@protobuf//': Error cloning repository: https://github.com/google/protobuf: cannot open git-upload-pack caused by https://github.com/google/protobuf: cannot open git-upload-pack caused by github.com and referenced by '//tensorflow/cc:tutorials_example_trainer'.
    ERROR: Analysis of target '//tensorflow/cc:tutorials_example_trainer' failed; build aborted.
    INFO: Elapsed time: 20.990s