Starting from Xcode 3.2.6 Apple dropped support for PPC architecture. What is even worse there's a big chance that you won't event notice it - I didn't and it caused releasing Que 1.3 build without PPC architecture.
Fortunately there is still easy way to restore PowerPC builds in Xcode. To do that you just need to change settings for your build target (right click on target and choose "Get Info"). Your current settings (without PPC) should look like:
Click on current architecture (the one marked with red rectangle), popup menu will appear - choose "Other..." option, following sheet should appear:
Now you need to edit architecture list, Que app supports i386 and PPC so for my case I deleted $(ARCHS_STANDARD_32_64_BIT) and added two other architectures:
Click OK and you should be set up.
You can easily test if it works for you - make a new build and check if output binary contains selected architecture - to do that just use file program (Unix command line tool for determining type of FILEs):
mymachine:~ wojtek$ file ~/que/trunk/build/Release/Que.app/Contents/MacOS/Que
/Users/wojtek/que/trunk/build/Release/Que.app/Contents/MacOS/Que: Mach-O universal binary with 2 architectures
/Users/wojtek/que/trunk/build/Release/Que.app/Contents/MacOS/Que (for architecture ppc7400): Mach-O executable ppc
/Users/wojtek/que/trunk/build/Release/Que.app/Contents/MacOS/Que (for architecture i386): Mach-O executable i386
As you can see everything worked fine and Que binary has 2 architectures. That's it.