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    use libc::*;

    cfg_if! {
        if #[cfg(ossl110)] {
            pub enum OPENSSL_STACK {}
        } else {
            #[repr(C)]
            pub struct _STACK {
                pub num: c_int,
                pub data: *mut *mut c_char,
                pub sorted: c_int,
                pub num_alloc: c_int,
                pub comp: Option<unsafe extern "C" fn(*const c_void, *const c_void) -> c_int>,
            }
        }
    }

    cfg_if! {
        if #[cfg(ossl110)] {
            extern "C" {
                pub fn OPENSSL_sk_num(stack: *const OPENSSL_STACK) -> c_int;
                pub fn OPENSSL_sk_value(stack: *const OPENSSL_STACK, idx: c_int) -> *mut c_void;

                pub fn OPENSSL_sk_new_null() -> *mut OPENSSL_STACK;
                pub fn OPENSSL_sk_free(st: *mut OPENSSL_STACK);
                pub fn OPENSSL_sk_pop_free(
                    st: *mut OPENSSL_STACK,
                    free: Option<unsafe extern "C" fn(*mut c_void)>,
                );
                pub fn OPENSSL_sk_push(st: *mut OPENSSL_STACK, data: *const c_void) -> c_int;
                pub fn OPENSSL_sk_pop(st: *mut OPENSSL_STACK) -> *mut c_void;
            }
        } else {
            extern "C" {
                pub fn sk_num(st: *const _STACK) -> c_int;
                pub fn sk_value(st: *const _STACK, n: c_int) -> *mut c_void;

                pub fn sk_new_null() -> *mut _STACK;
                pub fn sk_free(st: *mut _STACK);
                pub fn sk_pop_free(st: *mut _STACK, free: Option<unsafe extern "C" fn(*mut c_void)>);
                pub fn sk_push(st: *mut _STACK, data: *mut c_void) -> c_int;
                pub fn sk_pop(st: *mut _STACK) -> *mut c_void;
            }
        }
    }