Here are the steps I had to take to build WebKit on Windows 8.1 without Cygwin (Apple Win port)

1. Do NOT install Git from http://www.git-scm.com/download/win or http://msysgit.github.io/. This package will install a sh.exe next to git.exe (so it will therefore be in your $PATH), at a location which has spaces in it. This confuses GNU Make. The GitHub app has a similar problem.

2. Install the following programs:
  1. Visual Studio. https://www.visualstudio.com/en-us/products/visual-studio-community-vs
  2. ActiveState Perl. 64-bit is fine. http://www.activestate.com/activeperl/downloads
  3. ActiveState Python. Make sure it's version 2.x instead of 3.x. 64-bit is fine. http://www.activestate.com/activepython/downloads Make sure you don't download it from python.org because we hardcode the executable name as "python2.7" and the python.org python doesn't include an executable with that name.
  4. Ruby. 64-bit is fine. http://rubyinstaller.org/
  5. Gperf. http://gnuwin32.sourceforge.net/packages/gperf.htm
  6. Bison. http://gnuwin32.sourceforge.net/packages/bison.htm
  7. GNU Make. http://gnuwin32.sourceforge.net/packages/make.htm
  8. Subversion. http://sourceforge.net/projects/win32svn/

3. Make sure all the programs you just installed (except Visual Studio) are accessible through your $PATH. http://www.itechtics.com/customize-windows-environment-variables/ You may be required to reboot after modifying $PATH before new shells will see the updated variable.

4. > svn checkout https://svn.webkit.org/repository/webkit/trunk WebKit

5. Download the WebKit Support Libraries to the root of your source tree. If the file is incorrectly named, rename it to WebKitSupportLibrary.zip. Do not extract its contents.

TODO: Finish this