mac环境：10.11.6（15G31）
python:2.7.10
sudo pip install pymssql 后出现下面问题：
setup.py: Not using bundled FreeTDS
setup.py: include_dirs = ['/usr/local/include']
setup.py: library_dirs = ['/usr/local/lib']
running install
running build
running build_ext
building '_mssql' extension
creating build
creating build/temp.macosx-10.11-intel-2.7
cc -fno-strict-aliasing -fno-common -dynamic -arch i386 -arch x86_64 -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch i386 -arch x86_64 -pipe -I/usr/local/include -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c _mssql.c -o build/temp.macosx-10.11-intel-2.7/_mssql.o -DMSDBLIB
_mssql.c:266:10: fatal error: 'sqlfront.h' file not found
#include "sqlfront.h"
^
1 error generated.
error: command 'cc' failed with exit status 1
----------------------------------------
Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/private/tmp/pip-build-6afCqj/pymssql/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-Q1Ludg-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/tmp/pip-build-6afCqj/pymssql/
解决方案：
brew unlink freetds
brew install [email protected]
brew link --force [email protected]
sudo pip install pymssql