Currently Being ModeratedNov 10, 2012 10:01 AM (in response to Jon_d2)
Read the following, and see if the following steps eliminate the need for an earlier Xcode.
Make sure you have updated to OS X 10.8.2 (including supplement).
Install Xcode 4.5.2 from App Store.
From Xcode 4.5.2 preferences > Downloads > Components, Install the Command Line Tools.
(This puts the compilation environment in the expected /usr/bin location.)
Now, resolve /Developer with a hard link:
sudo ln /Applications/Xcode.app/Contents/Developer /Developer
sudo chown root:wheel /Developer
I cannot promise that the GTK jhbuild won't be checking for other dependencies that the above steps do not correct.
In your startup file, you should add the following to your PATH: /Applications/Xcode.app/Contents/Developer/usr/bin