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    // vendored from the cfg-if crate to avoid breaking ctest
    macro_rules! cfg_if {
        // match if/else chains with a final `else`
        ($(
            if #[cfg($($meta:meta),*)] { $($it:item)* }
        ) else * else {
            $($it2:item)*
        }) => {
            cfg_if! {
                @__items
                () ;
                $( ( ($($meta),*) ($($it)*) ), )*
                ( () ($($it2)*) ),
            }
        };

        // match if/else chains lacking a final `else`
        (
            if #[cfg($($i_met:meta),*)] { $($i_it:item)* }
            $(
                else if #[cfg($($e_met:meta),*)] { $($e_it:item)* }
            )*
        ) => {
            cfg_if! {
                @__items
                () ;
                ( ($($i_met),*) ($($i_it)*) ),
                $( ( ($($e_met),*) ($($e_it)*) ), )*
                ( () () ),
            }
        };

        // Internal and recursive macro to emit all the items
        //
        // Collects all the negated cfgs in a list at the beginning and after the
        // semicolon is all the remaining items
        (@__items ($($not:meta,)*) ; ) => {};
        (@__items ($($not:meta,)*) ; ( ($($m:meta),*) ($($it:item)*) ), $($rest:tt)*) => {
            // Emit all items within one block, applying an approprate #[cfg]. The
            // #[cfg] will require all `$m` matchers specified and must also negate
            // all previous matchers.
            cfg_if! { @__apply cfg(all($($m,)* not(any($($not),*)))), $($it)* }

            // Recurse to emit all other items in `$rest`, and when we do so add all
            // our `$m` matchers to the list of `$not` matchers as future emissions
            // will have to negate everything we just matched as well.
            cfg_if! { @__items ($($not,)* $($m,)*) ; $($rest)* }
        };

        // Internal macro to Apply a cfg attribute to a list of items
        (@__apply $m:meta, $($it:item)*) => {
            $(#[$m] $it)*
        };
    }

    macro_rules! stack {
        ($t:ident) => {
            cfg_if! {
                if #[cfg(ossl110)] {
                    pub enum $t {}
                } else {
                    #[repr(C)]
                    pub struct $t {
                        pub stack: ::_STACK,
                    }
                }
            }
        };
    }

    #[cfg(const_fn)]
    macro_rules! const_fn {
        ($(pub const fn $name:ident($($arg:ident: $t:ty),*) -> $ret:ty $b:block)*) => {
            $(
                pub const fn $name($($arg: $t),*) -> $ret $b
            )*
        }
    }

    #[cfg(not(const_fn))]
    macro_rules! const_fn {
        ($(pub const fn $name:ident($($arg:ident: $t:ty),*) -> $ret:ty $b:block)*) => {
            $(
                pub fn $name($($arg: $t),*) -> $ret $b
            )*
        }
    }

    // openssl changes `*mut` to `*const` in certain parameters in certain versions;
    // in C this is ABI and (mostly) API compatible.
    //
    // We need to handle this explicitly, and this macro helps annotate which
    // parameter got converted in which version.
    //
    // Input is:
    //    extern "C" {
    //        #[attributes...]
    //        pub fn name(args) -> rettype; // `-> rettype` optional
    //        // more functions...
    //    }
    //
    // This macro replaces `#[const_ptr_if(...)]` in types with `*const` or `*mut`
    // (depending on the inner cfg flags)
    //
    // Walks through all argument and return types, but only finds inner types of
    // `*const` and `*mut`; doesn't walk arrays or generics.
    //
    // NOTE: can't abstract `pub` as `$fn_vis:vis`, as ctest macro handling doesn't
    // support it (old syntax crate). But we really only need `pub` anyway.
    //
    // NOTE: ctest seams to simply ignore macros it can't expand (whatever the
    // reason)
    macro_rules! const_ptr_api {
        // ----------------------------------------------------------------
        // (partialarg): partial argument, waiting for "final" argument type
        // MAGIC PART 1: hande conditional const ptr in argument type
        ( (partialarg)
            { $(#[$fn_attr:meta])* pub fn $fn_name:ident }
            $args_packed:tt
            [ $($part_arg:tt)* ]
            [ #[const_ptr_if( $($cfg:tt)* )] $($arg_rem:tt)* ]
            $ret_packed:tt
        ) => {
            const_ptr_api!( (partialarg) { #[cfg($($cfg)*)]      $(#[$fn_attr])* pub fn $fn_name } $args_packed [ $($part_arg)* *const ] [ $($arg_rem)* ] $ret_packed );
            const_ptr_api!( (partialarg) { #[cfg(not($($cfg)*))] $(#[$fn_attr])* pub fn $fn_name } $args_packed [ $($part_arg)* *mut   ] [ $($arg_rem)* ] $ret_packed );
        };
        // continue partial argument with `*mut` pointer (might need special const handling in inner type)
        ( (partialarg)
            $def_packed:tt
            $args_packed:tt
            [ $($part_arg:tt)* ]
            [ *mut $($arg_rem:tt)* ]
            $ret_packed:tt
        ) => {
            const_ptr_api!( (partialarg) $def_packed $args_packed [ $($part_arg)* *mut ] [ $($arg_rem)* ] $ret_packed );
        };
        // continue partial argument with `*const` pointer (might need special const handling in inner type)
        ( (partialarg)
            $def_packed:tt
            $args_packed:tt
            [ $($part_arg:tt)* ]
            [ *const $($arg_rem:tt)* ]
            $ret_packed:tt
        ) => {
            const_ptr_api!( (partialarg) $def_packed $args_packed [ $($part_arg)* *const ] [ $($arg_rem)* ] $ret_packed );
        };
        // finish partial argument with trailing comma
        ( (partialarg)
            $def_packed:tt
            { $($args_tt:tt)* }
            [ $($part_arg:tt)* ]
            [ $arg_ty:ty, $($arg_rem:tt)* ]
            $ret_packed:tt
        ) => {
            const_ptr_api!( (parseargs) $def_packed { $($args_tt)* { $($part_arg)* $arg_ty } } [ $($arg_rem)* ] $ret_packed );
        };
        // finish final partial argument (no trailing comma)
        ( (partialarg)
            $def_packed:tt
            { $($args_tt:tt)* }
            [ $($part_arg:tt)* ]
            [ $arg_ty:ty ]
            $ret_packed:tt
        ) => {
            const_ptr_api!( (parseargs) $def_packed { $($args_tt)* { $($part_arg)* $arg_ty } } [ ] $ret_packed );
        };

        // ----------------------------------------------------------------
        // (parseargs): parsing arguments
        // start next argument
        ( (parseargs)
            $def_packed:tt
            $args_packed:tt
            [ $arg_name:ident : $($arg_rem:tt)* ]
            $ret_packed:tt
        ) => {
            const_ptr_api!( (partialarg) $def_packed $args_packed [ $arg_name: ] [ $($arg_rem)* ] $ret_packed );
        };
        // end of arguments, there is a return type; start parsing it
        ( (parseargs)
            $def_packed:tt
            $args_packed:tt
            [ ]
            [ -> $($rem:tt)* ]
        ) => {
            const_ptr_api!( (partialret) $def_packed $args_packed [] [ $($rem)* ] );
        };
        // end of arguments, no return type
        ( (parseargs)
            $def_packed:tt
            $args_packed:tt
            [ ]
            [ ]
        ) => {
            const_ptr_api!( (generate) $def_packed $args_packed { () } );
        };

        // ----------------------------------------------------------------
        // (partialret): have partial return type, waiting for final return type
        // MAGIC PART 2: hande conditional const ptr in return type
        ( (partialret)
            { $(#[$fn_attr:meta])* pub fn $fn_name:ident }
            $args_packed:tt
            [ $($part_ret:tt)* ]
            [ #[const_ptr_if( $($cfg:tt)* )] $($rem:tt)* ]
        ) => {
            const_ptr_api!( (partialret) { #[cfg($($cfg)*)]      $(#[$fn_attr])* pub fn $fn_name } $args_packed [ $($part_ret)* *const ] [ $($rem)* ] );
            const_ptr_api!( (partialret) { #[cfg(not($($cfg)*))] $(#[$fn_attr])* pub fn $fn_name } $args_packed [ $($part_ret)* *mut   ] [ $($rem)* ] );
        };
        // `* mut` part in return type; continue parsing to find inner conditional const ptr
        ( (partialret)
            $def_packed:tt
            $args_packed:tt
            [ $($part_ret:tt)* ]
            [ *mut $($rem:tt)* ]
        ) => {
            const_ptr_api!( (partialret) $def_packed $args_packed [ $($part_ret)* *mut ] [ $($rem)* ] );
        };
        // `* const` part in return type; continue parsing to find inner conditional const ptr
        ( (partialret)
            $def_packed:tt
            $args_packed:tt
            [ $($part_ret:tt)* ]
            [ *const $($rem:tt)* ]
        ) => {
            const_ptr_api!( (partialret) $def_packed $args_packed [ $($part_ret)* *const ] [ $($rem)* ] );
        };
        // final part of return type
        ( (partialret)
            $def_packed:tt
            $args_packed:tt
            [ $($part_ret:tt)* ]
            [ $ret_ty:ty ]
        ) => {
            const_ptr_api!( (generate) $def_packed $args_packed { $($part_ret)* $ret_ty } );
        };

        // ----------------------------------------------------------------
        // generate
        ( (generate)
            { $(#[$fn_attr:meta])* pub fn $fn_name:ident }
            { $({ $arg_name:ident: $($arg_ty:tt)* })* }
            { $ret_ty:ty }
        ) => {
            extern "C" {
                $(#[$fn_attr])*
                pub fn $fn_name( $(
                    $arg_name: $($arg_ty)*
                ),* ) -> $ret_ty;
            }
        };

        // ----------------------------------------------------------------
        // (fn): gather tokens for return type until ";"
        // found end; start parsing current function, and parse remaining functions
        ( (fn)
            $def_packed:tt
            $arg_tts_packed:tt
            $ret_packed:tt
            [ ; $($rem:tt)* ]
        ) => {
            const_ptr_api!( (parseargs) $def_packed {} $arg_tts_packed $ret_packed );
            const_ptr_api!( (extern) [ $($rem)* ] );
        };
        // not ";" - all other tokens are part of the return type.
        // don't expand return type yet; otherwise we'd have to remember in which branch `rem` needs
        // to be used to parse further functions.
        ( (fn)
            $def_packed:tt
            $arg_tts_packed:tt
            [ $($ret_tt:tt)* ]
            [ $tt:tt $($rem:tt)* ]
        ) => {
            const_ptr_api!( (fn) $def_packed $arg_tts_packed [ $($ret_tt)* $tt ] [ $($rem)* ] );
        };

        // ----------------------------------------------------------------
        // (extern): in extern block, find next function
        // try to split into functions as fast as possible to reduce recursion depth
        ( (extern) [
            $(#[$fn_attr:meta])*
            pub fn $fn_name:ident( $($arg_rem:tt)* ) $($rem:tt)*
        ] ) => {
            const_ptr_api!( (fn)
                { $(#[$fn_attr])* pub fn $fn_name } [ $($arg_rem)* ] [] [ $($rem)* ]
            );
        };
        // end of extern block
        ( (extern) [] ) => {};

        // ----------------------------------------------------------------
        // macro start; find extern block
        ( extern "C" { $($rem:tt)* } ) => {
            const_ptr_api!( (extern) [ $($rem)* ] );
        };
    }