    # File lib/phusion_passenger/platform_info/operating_system.rb, line 77
            def self.cpu_architectures
                    if os_name == "macosx"
                            arch = `uname -p`.strip
                            if arch == "i386"
                                    # Macs have been x86 since around 2007. I think all of them come with
                                    # a recent enough Intel CPU that supports both x86 and x86_64, and I
                                    # think every OS X version has both the x86 and x86_64 runtime installed.
                                    major, minor, *rest = `sw_vers -productVersion`.strip.split(".")
                                    major = major.to_i
                                    minor = minor.to_i
                                    if major >= 10 || (major == 10 && minor >= 6)
                                            # Since Snow Leopard x86_64 is the default.
                                            ["x86_64", "x86"]
                                    else
                                            # Before Snow Leopard x86 was the default.
                                            ["x86", "x86_64"]
                                    end
                            else
                                    arch
                            end
                    else
                            arch = `uname -p`.strip
                            # On some systems 'uname -p' returns something like
                            # 'Intel(R) Pentium(R) M processor 1400MHz'.
                            if arch == "unknown" || arch =~ / /
                                    arch = `uname -m`.strip
                            end
                            if arch =~ /^i.86$/
                                    arch = "x86"
                            elsif arch == "amd64"
                                    arch = "x86_64"
                            end

                            if arch == "x86"
                                    # Most x86 operating systems nowadays are probably running on
                                    # a CPU that supports both x86 and x86_64, but we're not gonna
                                    # go through the trouble of checking that. The main architecture
                                    # is what we usually care about.
                                    ["x86"]
                            elsif arch == "x86_64"
                                    # I don't think there's a single x86_64 CPU out there
                                    # that doesn't support x86 as well.
                                    ["x86_64", "x86"]
                            else
                                    [arch]
                            end
                    end
            end