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    macro_rules! expand_align {
        () => {
            s! {
                #[cfg_attr(any(target_pointer_width = "32",
                               target_arch = "x86_64",
                               target_arch = "powerpc64",
                               target_arch = "mips64",
                               target_arch = "s390x",
                               target_arch = "sparc64",
                               target_arch = "aarch64",
                               target_arch = "riscv64",
                               target_arch = "riscv32",
                               target_arch = "loongarch64"),
                           repr(align(4)))]
                #[cfg_attr(not(any(target_pointer_width = "32",
                                   target_arch = "x86_64",
                                   target_arch = "powerpc64",
                                   target_arch = "mips64",
                                   target_arch = "s390x",
                                   target_arch = "sparc64",
                                   target_arch = "aarch64",
                                   target_arch = "riscv64",
                                   target_arch = "riscv32",
                                   target_arch = "loongarch64")),
                           repr(align(8)))]
                pub struct pthread_mutexattr_t {
                    #[doc(hidden)]
                    size: [u8; ::__SIZEOF_PTHREAD_MUTEXATTR_T],
                }

                #[cfg_attr(any(target_env = "musl", target_pointer_width = "32"),
                           repr(align(4)))]
                #[cfg_attr(all(not(target_env = "musl"),
                               target_pointer_width = "64"),
                           repr(align(8)))]
                pub struct pthread_rwlockattr_t {
                    #[doc(hidden)]
                    size: [u8; ::__SIZEOF_PTHREAD_RWLOCKATTR_T],
                }

                #[repr(align(4))]
                pub struct pthread_condattr_t {
                    #[doc(hidden)]
                    size: [u8; ::__SIZEOF_PTHREAD_CONDATTR_T],
                }

                #[repr(align(8))]
                pub struct fanotify_event_metadata {
                    pub event_len: __u32,
                    pub vers: __u8,
                    pub reserved: __u8,
                    pub metadata_len: __u16,
                    pub mask: __u64,
                    pub fd: ::c_int,
                    pub pid: ::c_int,
                }
            }

            s_no_extra_traits! {
                #[cfg_attr(all(target_env = "musl",
                               target_pointer_width = "32"),
                           repr(align(4)))]
                #[cfg_attr(all(target_env = "musl",
                               target_pointer_width = "64"),
                           repr(align(8)))]
                #[cfg_attr(all(not(target_env = "musl"),
                               target_arch = "x86"),
                           repr(align(4)))]
                #[cfg_attr(all(not(target_env = "musl"),
                               not(target_arch = "x86")),
                           repr(align(8)))]
                pub struct pthread_cond_t {
                    #[doc(hidden)]
                    size: [u8; ::__SIZEOF_PTHREAD_COND_T],
                }

                #[cfg_attr(all(target_pointer_width = "32",
                               any(target_arch = "mips",
                                   target_arch = "arm",
                                   target_arch = "hexagon",
                                   target_arch = "m68k",
                                   target_arch = "powerpc",
                                   target_arch = "sparc",
                                   target_arch = "x86_64",
                                   target_arch = "x86")),
                           repr(align(4)))]
                #[cfg_attr(any(target_pointer_width = "64",
                               not(any(target_arch = "mips",
                                       target_arch = "arm",
                                       target_arch = "hexagon",
                                       target_arch = "m68k",
                                       target_arch = "powerpc",
                                       target_arch = "sparc",
                                       target_arch = "x86_64",
                                       target_arch = "x86"))),
                           repr(align(8)))]
                pub struct pthread_mutex_t {
                    #[doc(hidden)]
                    size: [u8; ::__SIZEOF_PTHREAD_MUTEX_T],
                }

                #[cfg_attr(all(target_pointer_width = "32",
                               any(target_arch = "mips",
                                   target_arch = "arm",
                                   target_arch = "hexagon",
                                   target_arch = "m68k",
                                   target_arch = "powerpc",
                                   target_arch = "sparc",
                                   target_arch = "x86_64",
                                   target_arch = "x86")),
                           repr(align(4)))]
                #[cfg_attr(any(target_pointer_width = "64",
                               not(any(target_arch = "mips",
                                       target_arch = "arm",
                                       target_arch = "hexagon",
                                       target_arch = "m68k",
                                       target_arch = "powerpc",
                                       target_arch = "sparc",
                                       target_arch = "x86_64",
                                       target_arch = "x86"))),
                           repr(align(8)))]
                pub struct pthread_rwlock_t {
                    size: [u8; ::__SIZEOF_PTHREAD_RWLOCK_T],
                }

                // linux/can.h
                #[repr(align(8))]
                #[allow(missing_debug_implementations)]
                pub struct can_frame {
                    pub can_id: canid_t,
                    pub can_dlc: u8,
                    __pad: u8,
                    __res0: u8,
                    __res1: u8,
                    pub data: [u8; CAN_MAX_DLEN],
                }

                #[repr(align(8))]
                #[allow(missing_debug_implementations)]
                pub struct canfd_frame {
                    pub can_id: canid_t,
                    pub len: u8,
                    pub flags: u8,
                    __res0: u8,
                    __res1: u8,
                    pub data: [u8; CANFD_MAX_DLEN],
                }
            }
        };
    }