Unity iPhone Openfeint (?) Xcode Compiling Error

I am trying to update Openfeint within my game, but (after following the steps on the Openfeint site) there is still error in Xcode. Here is a sampling of what the error says (there are many other lines similar to the first line below):

 /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/include/sys/wait.h:229:FATAL:Symbol w_Filler already defined.
 clang: error: assembler command failed with exit code 1 (use -v to see invocation)
 Command /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/clang failed with exit code 1

The only thing in the Openfeint instructions that doesn't make sense is what a root folder is. I assumed that it was the main folder of the app (it contains library, assets, the build of the project, and so on), but I am really not sure. I also am assuming that the problem has to do with Openfeint, but that too could be wrong.

Thanks in advance!