bazel: Bazel 0.5.0 build fails on Mac OS X El Capitan

Description of the problem / feature request / question:

Bazel build fails on Mac OS X El Capitan (Version 10.11.6). The same build completes without any issue on Ubuntu 14.04. It looks like this is a mac specific issue.

Mac (build error):

$ bazel version
Build label: 0.5.0-homebrew
Build target: bazel-out/darwin_x86_64-opt/bin/src/main/java/com/google/devtools/build/lib/bazel/BazelServer_deploy.jar
Build time: Fri May 26 14:50:47 2017 (1495810247)
Build timestamp: 1495810247
Build timestamp as int: 1495810247
$
$
$ sw_vers 
ProductName:	Mac OS X
ProductVersion:	10.11.6
BuildVersion:	15G1510
$
$
$ bazel build --verbose_failures :all
ERROR: in target '//external:cc_toolchain': no such package '@local_config_cc//': Traceback (most recent call last):
	File "/private/var/tmp/_bazel_user/6f6133ece88806ce1513398e26791cf1/external/bazel_tools/tools/cpp/cc_configure.bzl", line 829
		_get_escaped_darwin_cxx_inc_directories(repository_ctx, cc)
	File "/private/var/tmp/_bazel_user/6f6133ece88806ce1513398e26791cf1/external/bazel_tools/tools/cpp/cc_configure.bzl", line 726, in _get_escaped_darwin_cxx_inc_directories
		for toolchain in toolchains: ...
type 'NoneType' is not iterable.
INFO: Elapsed time: 3.445s

Ubuntu (no error):

$ bazel version
Build label: 0.5.0
Build target: bazel-out/local-fastbuild/bin/src/main/java/com/google/devtools/build/lib/bazel/BazelServer_deploy.jar
Build time: Fri May 26 12:11:50 2017 (1495800710)
Build timestamp: 1495800710
Build timestamp as int: 1495800710
$
$
$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 14.04.4 LTS
Release:	14.04
Codename:	trusty
$
$
$ # I already ran the build, it succeeded without any issues
$ bazel build --verbose_failures :all
INFO: Found 1 target...
Target //:env up-to-date (nothing to build)
INFO: Elapsed time: 0.128s, Critical Path: 0.00s

If possible, provide a minimal example to reproduce the problem:

On a mac, the following produces the error

$ bazel build --verbose_failures :all

Environment info

• Operating System: ProductName: Mac OS X ProductVersion: 10.11.6 BuildVersion: 15G1510

• Bazel version (output of bazel info release): release 0.5.0-homebrew

Anything else, information or logs or outputs that would be helpful?

I’m trying to build the same project on both mac and ubuntu which is version controlled with git. So i’m confident that the two build sources are identical.