For OpenSuSE: There are instructions for building [in the wiki](https://github.com/micahflee/onionshare/wiki/Linux-Distribution-Support#opensuse-leap-150).
If you find that these instructions don't work for your Linux distribution or version, consult the [Linux Distribution Support wiki guide](https://github.com/micahflee/onionshare/wiki/Linux-Distribution-Support), which might contain extra instructions.
Install Xcode from the Mac App Store. Once it's installed, run it for the first time to set it up. Also, run this to make sure command line tools are installed: `xcode-select --install`. And finally, open Xcode, go to Preferences > Locations, and make sure under Command Line Tools you select an installed version from the dropdown. (This is required for installing Qt5.)
You may also need to run the command `/Applications/Python\ 3.6/Install\ Certificates.command` to update Python 3.6's internal certificate store. Otherwise, you may find that fetching the Tor Browser .dmg file fails later due to a certificate validation error.
Download and install Qt5 from https://www.qt.io/download-open-source/. I downloaded `qt-unified-mac-x64-3.0.5-online.dmg`. There's no need to login to a Qt account during installation. When you select components, install the `macOS` component from Qt 5.11.1 (or whatever the latest Qt version is).
Download Python 3.7.0, 32-bit (x86) from https://www.python.org/downloads/release/python-370/. I downloaded `python-3.7.0.exe`. When installing it, make sure to check the "Add Python 3.7 to PATH" checkbox on the first page of the installer.
Download and install pywin32 (build 223, x86, for python 3.7) from https://github.com/mhammond/pywin32/releases/tag/b223. I downloaded `pywin32-223.win32-py3.7.exe`.
Download and install Qt5 from https://www.qt.io/download-open-source/. I downloaded `qt-unified-windows-x86-3.0.5-online.exe`. There's no need to login to a Qt account during installation. When you can select components, install the `MSVC 2015 32-bit` component from Qt 5.11.1 (or whatever the latest Qt version is).
These instructions include adding folders to the path in Windows. To do this, 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. From there you can add and remove folders that are available in the PATH.
Download and install the 32-bit [Visual C++ Redistributable for Visual Studio 2015](https://www.microsoft.com/en-US/download/details.aspx?id=48145). I downloaded `vc_redist.x86.exe`.
Download and install the standalone [Windows 10 SDK](https://dev.windows.com/en-us/downloads/windows-10-sdk). Note that you may not need this if you already have Visual Studio.
* You'll need a code signing certificate. I got an open source code signing certificate from [Certum](https://www.certum.eu/certum/cert,offer_en_open_source_cs.xml).
* Open a command prompt, cd into the onionshare directory, and type: `pyinstaller install\pyinstaller.spec`. `onionshare-gui.exe` and all of their supporting files will get created inside the `dist` folder.
Note that you must have a codesigning certificate installed in order to use the `install\build_exe.bat` script, because it codesigns `onionshare-gui.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`.