Note that python3-stem appears in Debian wheezy and newer, and it appears in Ubuntu 13.10 and newer. Older versions of Debian and Ubuntu aren't supported.
Note that OnionShare uses stdeb to generate Debian packages, and `python3-stdeb` is not available in Ubuntu 14.04 (Trusty). Because of this, you can't use the `build_install.sh` script to build the .deb file in versions of Ubuntu 14.04 and earlier. However, .deb files you build in later versions of Ubuntu will install and work fine in 14.04.
Install the [latest Python 3.x from python.org](https://www.python.org/downloads/). If you use the built-in version of python that comes with OS X, your .app might not run on other people's computers.
Download and install Qt5 from https://www.qt.io/download-open-source/. I downloaded `qt-unified-mac-x64-2.0.2-2-online.dmg`. There's no need to login to a Qt account during installation. Make sure you install the latest Qt 5.x for clang.
Download the source code for [SIP](http://www.riverbankcomputing.co.uk/software/sip/download) and [PyQt](http://www.riverbankcomputing.co.uk/software/pyqt/download5). I downloaded `sip-4.17.tar.gz` and `PyQt-gpl-5.5.1.tar.gz`.
* Go to Start and type "advanced system settings", and open "View advanced system settings" in the Control Panel. Click Environment Variables. Under "System variables" double-click on Path, and add `C:\Python27` and `C:\Python27\Scripts`. Now you can just type `python` to run python scripts in the command prompt.
* 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`.
* Go to Start and type "advanced system settings", and open "View advanced system settings" in the Control Panel. Click Environment Variables. Under "System variables" double-click on Path, and add `C:\Program Files (x86)\NSIS` to the end. Now you can just type `makensis [script]` to build an installer.
* You'll need a code signing certificate. I roughly followed [this guide](http://blog.assarbad.net/20110513/startssl-code-signing-certificate/) to make one using my StartSSL account.
* Go to http://msdn.microsoft.com/en-us/vstudio/aa496123 and install the latest .NET Framework. I installed `.NET Framework 4.6`.
* Go to http://www.microsoft.com/en-us/download/confirmation.aspx?id=8279 and install the Windows SDK.
* Right click on Computer, go to Properties. Click "Advanced system settings". Click Environment Variables. Under "System variables" double-click on Path and add `C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin` to the end.
* Windows 10:
* Go to https://dev.windows.com/en-us/downloads/windows-10-sdk and install the standalone Windows 10 SDK. Note that you may not need this if you already have Visual Studio.
* Go to Start and type "advanced system settings", and open "View advanced system settings" in the Control Panel. Click Environment Variables. Under "System variables" double-click on Path, and add `C:\Program Files (x86)\Windows Kits\10\bin\x86`.
* Open a command prompt, cd into the onionshare directory, and type: `pyinstaller -y install\onionshare-win.spec`. Inside the `dist` folder there will be a folder called `onionshare` with `onionshare.exe` in it.
Note that you must have a codesigning certificate installed in order to use the `install\build_exe.bat` script, because it codesigns `onionshare.exe`, `uninstall.exe`, and `OnionShare_Setup.exe`.
This will prompt you to codesign three binaries and execute one unsigned binary. When you're done clicking through everything you will have `dist\OnionShare_Setup.exe`.