.so is the ending for dynamic libraries on UNIX. I assume you know that. Can’t give you any advise aside from “try it with pip install”.
WINDOWS: what you need to do first is download a 64bit version of python. Default python download for windows is 32bit on python.org.
https://www.python.org/ftp/python/3.4.1/python-3.4.1.amd64.msi
If you don’t have Visual Studio 2010, install it. http://www.visualstudio.com/downloads/download-visual-studio-vs
Once you have that you also need to install Windows 7.1 SDK:
http://www.microsoft.com/en-us/download/details.aspx?id=8442
Make sure you download GRMSDKX which is for 64bit. You probably have to uninstall VC++2010 Redistributable in order to be able to install GRMSDKX. You may also need to update your VC compiler: http://support.microsoft.com/kb/2519277/en
In the command-line console then enter (right click for copy paste):
CALL “C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd” /x64
pip install pyproj
The source files from pyproj website did not work for me, pip install did.pyproj will be installed in C:\Python34\Lib\site-packages\pyproj. Copy that folder now to Blender-Installation\2.70\scripts\modules.
Attached you’ll find a 64bit build for new testbuilds of the upcoming Blender 2.71 with python 3.4.
pyproj.zip (1.39 MB)