Tests fail on Mac OSX 10.9.5, conda 3.7.2

I'm getting this error:

_$ condo build python-blosc_
_TESTS FAILED: python-blosc-1.2.4-np18py27_0_

Here is the tail of the output:

byte-compiling /Users/agardner/anaconda/envs/_build/lib/python2.7/site-packages/blosc/__init__.py to **init**.pyc
byte-compiling /Users/agardner/anaconda/envs/_build/lib/python2.7/site-packages/blosc/test.py to test.pyc
byte-compiling /Users/agardner/anaconda/envs/_build/lib/python2.7/site-packages/blosc/toplevel.py to toplevel.pyc
byte-compiling /Users/agardner/anaconda/envs/_build/lib/python2.7/site-packages/blosc/version.py to version.pyc
running install_egg_info
Writing /Users/agardner/anaconda/envs/_build/lib/python2.7/site-packages/blosc-1.2.4-py2.7.egg-info
number of files: 10
BUILD END: python-blosc-1.2.4-np18py27_0
TEST START: python-blosc-1.2.4-np18py27_0
Fetching package metadata: ....
Solving package specifications: .
The following packages will be downloaded:

| package | build |
| --- | --- |
| python-blosc-1.2.4 | np18py27_0 101 KB |

The following NEW packages will be INSTALLED:

```
numpy: 1.8.2-py27_0
openssl: 1.0.1h-1
python: 2.7.8-1
python-blosc: 1.2.4-np18py27_0
readline: 6.2-2
sqlite: 3.8.4.1-0
tk: 8.5.15-0
zlib: 1.2.7-1
```

Fetching packages ...
python-blosc-1 100% |################################################| Time: 0:00:00 83.87 MB/s
Extracting packages ...
[ COMPLETE ] |##################################################################| 100%
Linking packages ...
[ COMPLETE ] |##################################################################| 100%
===== testing package: python-blosc-1.2.4-np18py27_0 =====
import: u'blosc'
Traceback (most recent call last):
File "/Users/agardner/anaconda/conda-bld/test-tmp_dir/run_test.py", line 26, in
import blosc
File "/Users/agardner/anaconda/envs/_test/lib/python2.7/site-packages/blosc/__init__.py", line 12, in
from blosc.toplevel import (
File "/Users/agardner/anaconda/envs/_test/lib/python2.7/site-packages/blosc/toplevel.py", line 16, in
from blosc import blosc_extension as _ext
ImportError: dlopen(/Users/agardner/anaconda/envs/_test/lib/python2.7/site-packages/blosc/blosc_extension.so, 2): Symbol not found: __ZNSs4_Rep11_S_max_sizeE
Referenced from: /Users/agardner/anaconda/envs/_test/lib/python2.7/site-packages/blosc/blosc_extension.so
Expected in: dynamic lookup

TESTS FAILED: python-blosc-1.2.4-np18py27_0