I'm trying to declare a BN_CTX on the stack (with a subsequent call to
BN_CTX_init) to stay out of the memory manager.

When I do, I get an error:

    aggregate ‘BN_CTX’ has incomplete type and cannot be defined

I've included <openssl/bn.h>, so I'm kind of surprised I can't
compile. (<openssl/bn.h> has some typedefs and comments about
definitions in ossl_typ.h).

Grepping sources:

    $ grep -R BN_CTX_init *
    ...
    crypto/bn/exp.c:    BN_CTX_init(&ctx);

does not show me anything interesting because it looks like I'm doing
what exp.c is doing:

    BN_CTX ctx;
    BIGNUM a,b,c,r,rr,t,l;
    ...

    BN_CTX_init(&ctx);

How do I declare a BN_CTX on the stack?

Thanks in advance.
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