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sndfile not found on os x

See original GitHub issue

yosemite 10.10.2

$ python
Python 2.7.9 |Continuum Analytics, Inc.| (default, Dec 15 2014, 10:37:34) 
[GCC 4.2.1 (Apple Inc. build 5577)] on darwin
>>> import pysoundfile as sf
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/software/anaconda/envs/devpype/lib/python2.7/site-packages/pysoundfile.py", line 240, in <module>
    _snd = _ffi.dlopen('sndfile')
  File "/software/anaconda/envs/devpype/lib/python2.7/site-packages/cffi/api.py", line 121, in dlopen
    lib, function_cache = _make_ffi_library(self, name, flags)
  File "/software/anaconda/envs/devpype/lib/python2.7/site-packages/cffi/api.py", line 493, in _make_ffi_library
    backendlib = _load_backend_lib(backend, libname, flags)
  File "/software/anaconda/envs/devpype/lib/python2.7/site-packages/cffi/api.py", line 481, in _load_backend_lib
    raise OSError("library not found: %r" % (name,))
OSError: library not found: 'sndfile'

and the sndfile binaries and libraries are all available.

$ snd<TAB>
sndfile-cmp           sndfile-deinterleave  sndfile-metadata-get  sndfile-regtest       
sndfile-concat        sndfile-info          sndfile-metadata-set  sndfile-salvage       
sndfile-convert       sndfile-interleave    sndfile-play

and

$ ls /usr/local/Cellar/libsndfile/1.0.25/
AUTHORS         INSTALL_RECEIPT.json    bin         share
COPYING         NEWS            include
ChangeLog       README          lib