Tunnelblick comes set up to be built using Xcode 3.2.2 on OS X 10.6.8 but can be built with Xcode 5.1.1 on OS X 10.8.5 or Xcode 6.3 and higher on OS X 10.10.3 or higher.
PowerPC and Intel processors and OS X 10.4 - 10.10 are supported only when Tunnelblick is built using Xcode 3.2.2 on OS X 10.6.8.
Xcode 5.1.1 and 6.3 and higher only generate 64-bit Intel code and are for use on OS X 10.6 - 10.10 and higher only.
To use Xcode 3.2.2 on OS X 10.6.8:
Double-click tunnelblick/Tunnelblick.xcodeproj to being using Xcode.
To use a different version of Xcode on a different version of OS X:
Quit Xcode
Replace
tunnelblick/tunnelblick.xcodeproj
with a tunnelblick.xcodeproj from the appropriate folder:
tunnelblick/xcodeproj-versions/xcode6.3 (on OS X 10.10.3)
tunnelblick/xcodeproj-versions/xcode5.1.1 (on OS X 10.8.5)
tunnelblick/xcodeproj-versions/xcode3.2.2 (on OS X 10.6.8)
Double-click tunnelblick/Tunnelblick.xcodeproj to begin.
Be sure to do a "Clean all targets" before building.