Suppressing "Undefined symbol" in Xcode (4)

I am getting and "Undefined symbol" error while compiling an iPhone app. I had read somewhere about adding two flags in "Other linker flags" in Xcode project settings but don't remember them now.

Can anyone please tell开发者_开发问答 me what are the flags for suppressing these errors in Xcode?

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Add -force_flat_namespace -undefined suppress to Other Linker Flags in Xcode Build Settings.