How do I set GCC build settings of an iPhone Project, namely Other C Flags? This item is present in Mac Cocoa/Carbon projects, but I can't find it in iPhone projects. If I look at this screenshot in Apple's documentation it is different than Inspector window in my project. My project misses the whole GCC Code generation section. I wanted to add -Wundeclared-selector flag I found in GCC documentation but I can only do it in the Inspector for each ObjC file, not on a project level. Any ideas?