Xcode building to both architectures when I only want one?

I have a fairly simple (one source file) command line application in C which was written for Linux but ought to run in OSX as long as I can provide its dependencies (some GNU libraries). I compiled/installed the GNU libraries it needed using Fink. Fink only builds Intel binaries, since I am using an Intel Mac. Because of this, I need Xcode to only try to compile my little application as an Intel (i386) binary, and not try to make a PPC binary or a Universal binary.
I opened "Project" -> "Edit Project Settings..." -> clicked on the "Build" tab and went to the "Architectures" setting. I made sure it said only "i386" and did a Clean and then another Build. However I can clearly see in the build log that Xcode is invoking the compiler and linker twice each -- once for each CPU architecture. After compiling the PPC version of my code it will fail to link, because there are no PPC versions of its dependencies (the GNU libraries).
Why is Xcode doing this, and is there a second setting that I haven't found, to make it ONLY build an Intel binary?

I tried your experiment and saw a similar problem... I'm on a PPC Mac though. Initially the standard tool was building a Universal Binary even though the Project Info -> Build -> Architectures was just set to "ppc".
So first I tried going to the "General" pane of the Project Info window and switching the pop-up at "Cross-Develop Using Target SDK:" from "Mac OS X 10.4 (Universal)" to "Current Mac OS"... That still tried to build a universal binary only this time I got several errors on the Intel link phase because the "Current OS" SDK contained no Intel libraries.
However there appears to be a different Architectures setting on a per Target basis.
In your "Groups & Files" pane expand the "Targets" group and select your target. Then click the "Info" button in the toolbar (or select "File -> Get Info") to get to the Target Info window. Select the "Build" pane... On my machine the "Architectures" setting here was set to both "ppc" and "i386". Turning off the "i386" here fixed my problem and allowed it to build only for ppc.
I'm not sure how these Target settings roll up into what you see in the Project settings. But it does seem kind of odd.
Steve

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