I have XCode installed and also FreeTDS. I tried to connect to my SQL Server and it works perfect.
Now I have to develop an aplication on python that works with this SQL
Or, try this fork, it installs without issues:
https://github.com/blackbass1988/pymssql-macos-lion
To install on OS X Mavericks, you need
OS X Command Line Tools
FreeTDS
brew install freetds
Cython
pip install cython
and then finally you can install the pymssql-macoslion
pip install git+git://github.com/blackbass1988/pymssql-macos-lion.git@master