Installation problem on FreeBSD 10.0 with Python 3.4.3
Hi,

I'm attempting to install pandas in a virtualenv on a FreeBSD system with Python 3.4.3. I can't see that I'm missing any obvious steps or dependancies. I get an error in a C module when importing pandas if I install pandas from pip, from a release tarball and with the repo (same error every time) that would imply something pretty major is missing. numpy, scipy and scikit-learn all install without any issues in the same venv. Example of the error:

``` bash
(venv)hostname% pip install --upgrade pandas
Collecting pandas
Requirement already up-to-date: pytz>=2011k in ./venv/lib/python3.4/site-packages (from pandas)
Requirement already up-to-date: numpy>=1.7.0 in ./venv/lib/python3.4/site-packages (from pandas)
Requirement already up-to-date: python-dateutil>=2 in ./venv/lib/python3.4/site-packages (from pandas)
Requirement already up-to-date: six>=1.5 in ./venv/lib/python3.4/site-packages (from python-dateutil>=2->pandas)
Installing collected packages: pandas
Successfully installed pandas-0.16.2

(venv)hostname% python
Python 3.4.3 (default, Jun 18 2015, 17:00:30)
[GCC 4.2.1 Compatible FreeBSD Clang 3.4.1 (tags/RELEASE_34/dot1-final 208032)] on freebsd10
Type "help", "copyright", "credits" or "license" for more information.
>>> import pandas
Traceback (most recent call last):
  File "/home/someuser/venv/lib/python3.4/site-packages/pandas/__init__.py", line 7, in <module>
    from pandas import hashtable, tslib, lib
ImportError: /home/someuser/venv/lib/python3.4/site-packages/pandas/hashtable.so: Undefined symbol "get_c_string"

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/someuser/venv/lib/python3.4/site-packages/pandas/__init__.py", line 13, in <module>
    "extensions first.".format(module))
ImportError: C extension: /home/someuser/venv/lib/python3.4/site-packages/pandas/hashtable.so: Undefined symbol "get_c_string" not built. If you want to import pandas from the source directory, you may need to run 'python setup.py build_ext --inplace' to build the C extensions first.
>>>
```

When installing from a tarbal or the a checkout of the repo where setup.py is accessible and following the above suggestion (`python setup.py build_ext --inplace`) it compiles without issue it does not resolve the issue.

Some system information (print_versions.py taken from a repo checkout):

``` bash
(venv)hostname% python print_versions.py

INSTALLED VERSIONS
------------------
commit: None
python: 3.4.3.final.0
python-bits: 64
OS: FreeBSD
OS-release: 10.1-RELEASE-p10
machine: amd64
processor: amd64
byteorder: little
LC_ALL: None
LANG: None

pandas: None
nose: 1.3.7
Cython: 0.22.1
numpy: 1.9.2
scipy: 0.15.1
statsmodels: None
IPython: None
sphinx: None
patsy: None
dateutil: 2.4.2
pytz: 2015.4
bottleneck: 1.0.0
tables: None
numexpr: 2.4.3
matplotlib: 1.4.3
openpyxl: None
xlrd: None
xlwt: None
xlsxwriter: None
lxml: None
bs4: None
html5lib: None
httplib2: None
apiclient: None
sqlalchemy: None
pymysql: None
psycopg2: 2.6.1 (dt dec pq3 ext lo64)
```

Any pointers would be appreciated, thanks. 
