Mark BROKEN: fails to build

Extracting Bazel installation...
ERROR: /wrkdirs/usr/ports/science/py-tensorflow/work/tensorflow-1.2.1/bazel_ot/f4693a59cc0f39b12832b03860533e20/external/io_bazel_rules_closure/closure/private/defs.bzl:27:16: The set constructor for depsets is deprecated and will be removed. Please use the depset constructor instead. You can temporarily enable the deprecated set constructor by passing the flag --incompatible_disallow_set_constructor=false
ERROR: error loading package '': Extension file 'closure/private/defs.bzl' has errors

Reported by: pkg-fallout