Well I spent around 5 minutes downloading and trying to build, immediately hitting this wall on Windows:
http://i.imgur.com/J9Gs6wb.png
Seems that nobody has tried that in a long time, or who knows why it references something in C:\tools
Seems that nobody has tried that in a long time, or who knows why it references something in C:\tools
`\WebKitLibraries\win\tools\vsprops`
Into `C:\tools\vsprops`
Worked for me.