Note that python-stem appears in Debian wheezy and newer (so by extension Tails 1.1 and newer), and it appears in Ubuntu 13.10 and newer. Older versions of Debian and Ubuntu aren't supported.
To install the right dependencies, you need homebrew and pip installed on your Mac. Follow instructions at http://brew.sh/ to install homebrew, and run `sudo easy_install pip` to install pip.
The first time you're setting up your dev environment:
* Download and install the latest python 2.7 from https://www.python.org/downloads/ -- make sure you install the 32-bit version.
* Right click on Computer, go to Properties. Click "Advanced system settings". Click Environment Variables. Under "System variables" double-click on Path to edit it. Add `;C:\Python27;C:\Python27\Scripts` to the end. Now you can just type `python` to run python scripts in the command prompt.
* Go to https://pip.pypa.io/en/latest/installing.html. Right-click on `get-pip.py` and Save Link As, and save it to your home folder.
* Open `cmd.exe` as an administrator. Type: `python get-pip.py`. Now you can use `pip` to install packages.
* Go to http://www.riverbankcomputing.com/software/pyqt/download and download the latest PyQt4 for Windows for python 2.7, 32-bit (I downloaded `PyQt4-4.11-gpl-Py2.7-Qt4.8.6-x32.exe`), then install it.
* Go to http://sourceforge.net/projects/pywin32/ and download and install the latest 32-bit pywin32 binary for python 2.7. I downloaded `pywin32-219.win32-py2.7.exe`.
* Open a command prompt, cd into the onionshare directory, and type: `pyinstaller -y setup\onionshare-win.spec`. Inside the `dist` folder there will be a folder called `onionshare` with `onionshare.exe` in it.
* Go to http://nsis.sourceforge.net/Download and download the latest NSIS. I downloaded `nsis-3.0b0-setup.exe`.
* Right click on Computer, go to Properties. Click "Advanced system settings". Click Environment Variables. Under "System variables" double-click on Path to edit it. Add `;C:\Program Files (x86)\NSIS` to the end. Now you can just type `makensisw [script]` to build an installer.
* Follow the steps above until to make the .exe. You should have a folder called `dist\onionshare` with a bunch of files inside of it, including `onionshare.exe`. Run `onionshare.exe` once before you build the installer, to compile all the `.py` files into `.pyc` files.
* Open a command prompt, cd into the onionshare directory, and type: `makensisw setup\onionshare.nsi`. You'll find the installer, `OnionShare_Setup.exe`, inside the `dist` folder.