Apple

I have created a static lib that includes a category and use it in an iPhone app. At runtime I get an unrecognized selector error when invoking the method defined in the category. I found Info here about specifieng the -ObjC linker flag. I tried this by specifying it in the static libs targed under Info --> Build --> Linking --> Other Linker Flag. I did this for the correct configuration, in my case debug. But the runtime error remains. Where do I need to specify the above flag to get this going?