This procedure is kind of complicated, but it gets it done with free tools (and a few downloaded add-ons).

Install everything that the Synergy Wiki recommends. I do this in a special VM just for this, because some of these tools are really old and I don't like keeping them installed.

• CMake 3.3.1
• Python 2.7.10
• Qt SDK 2010.02
• Wix 3.9
• Bonjour SDK for Windows 3.0
• Make sure CMake and Python are added to your PATH.

We're doing a 64-bit build, and the Synergy Wiki recommends VS 2005 or 2008, but I will explain how to get this done for free with Visual C++ 2010 Express. Install the following (in order, as recommended here):

• Visual C++ 2010 Express Edition
• Windows SDK for Windows 7 and .NET Framework 4
  • This will not install in Windows 10 without hackery. See this workaround.
• Visual Studio 2010 SP1
• Visual C++ 2010 Service Pack 1 Compiler Update for the Windows SDK 7.1

Grab a few extras normally included with the full Visual Studio 2010 but not with Express (search for them if you can't find them…)

• vcvars64.bat for Visual Studio 2010
  • Install this in C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin\amd64
• Microsoft_VC100_CRT_x64.msm for Visual Studio 2010
  * Install this in C:\Program Files (x86)\Common Files\Merge Modules

• Start a Command Prompt, go into the synergy source directory.
• Add Qt to the PATH:
  • set PATH=%PATH%;C:\Qt\2010.02\qt\bin;C:\Qt\2010.02\bin;C:\Qt\2010.02\mingw\bin
• Figure out the correct generator:
  • hm genlist
• Use the generator for Visual Studio 10 Win64 (2 as of this writing):
  • hm conf -g2
• Build it:
  • hm build
• Fix something in the installer:
  • In ext/toolchain/commands1.py, edit getVersionForFilename to return a string e.g. “v1.7.4-stable” instead of trying to run git.
• Build the installer:
  • hm package win