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我正在尝试通过openssl从给定的秘密中计算公钥。我收到此错误：

main.c:27: error: incomplete definition of type 'struct ec_key_st'
  printf("d: %s\n", BN_bn2hex(eckey->priv_key));
                              ~~~~~^

这是我的代码：

#include <stdio.h>

#include <openssl/ec.h>
#include <openssl/ecdsa.h>
#include <openssl/bn.h>
#include <openssl/obj_mac.h>

int main()
{
  BN_CTX *ctx = BN_CTX_new();

  EC_KEY *eckey = EC_KEY_new();
  EC_GROUP *group = EC_GROUP_new_by_curve_name(NID_secp256k1);
  EC_KEY_set_group(eckey, group);

  BIGNUM *prv = BN_new();
  BN_hex2bn(&prv, "b14fac12b3fa7dd6f2562a18d554fcd6818137ebb7e0d119ab0776d6407664f9");
  EC_KEY_set_private_key(eckey, prv);

  EC_POINT *Q = EC_POINT_new(group);
  EC_POINT_mul(group, Q, prv, NULL, NULL, ctx);
  EC_KEY_set_public_key(eckey, Q);

  if (EC_KEY_check_key(eckey))
    printf("Key succesfully checked.\n");

  printf("d: %s\n", BN_bn2hex(eckey->priv_key));
  printf("X: %s\n", BN_bn2hex(&eckey->pub_key->X));
  printf("Y: %s\n", BN_bn2hex(&eckey->pub_key->Y));

  EC_GROUP_free (group); group = NULL; …