It's quite simple, follow the instructions, but remember that GDataXMLNode does not support ARC. You can do the same instructions as Andrew. But I think that it should be located in a subproject, for example: Library.xcodeproj . If you want to organize your code formally.
First, create a Library.xcodeproject , add a GDataXMLNode. In Build Settings you also include the Header Search Path and Other Linker Flags. But do not forget that GDataXMLNode does not support ARC. Go to Build Phrases , under Compile Sources select the GDataXMlNode.m menu, set the compiler flag for it: -fno-objc-arc
Now for any subproject that you want to use this library, just go to "Build Settings", in the "User" properties of the Header Search Path select: ../IPLibrary/** or ../IPLibrary and select the recursive option.
Now you can enable GDataXMLNode. By the way, your project looks more professional, since lib and source code are separated separately. Good luck.
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