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    s! {
        // FIXME this is actually a union
        #[cfg_attr(target_pointer_width = "32",
                   repr(align(4)))]
        #[cfg_attr(target_pointer_width = "64",
                   repr(align(8)))]
        pub struct sem_t {
            #[cfg(target_pointer_width = "32")]
            __size: [::c_char; 16],
            #[cfg(target_pointer_width = "64")]
            __size: [::c_char; 32],
        }
    }