Note: When you migrate an existing project from an older version
                        of Xcode to Xcode 4.3, you may see a build error: No
                            architectures to compile for (ARCHS=i386,
                            VALID_ARCHS=armv6,armv7). You can resolve this Xcode 4 issue
                        by manually editing "Valid Architectures" under Targets, to add
                            i386.