class Xcodeproj::Project::Object::PBXNativeTarget

def add_file_references(file_references, compiler_flags = {})
  file_references.map do |file|
    extension = File.extname(file.path).downcase
    header_extensions = Constants::HEADER_FILES_EXTENSIONS
    is_header_phase = header_extensions.include?(extension)
    phase = is_header_phase ? headers_build_phase : source_build_phase
    unless build_file = phase.build_file(file)
      build_file = project.new(PBXBuildFile)
      build_file.file_ref = file
      phase.files << build_file
    end
    if compiler_flags && !compiler_flags.empty? && !is_header_phase
      (build_file.settings ||= {}).merge!('COMPILER_FLAGS' => compiler_flags) do |_, old, new|
        [old, new].compact.join(' ')
      end
    end
    yield build_file if block_given?
    build_file
  end
end