>>>   CXX      src/math/src_libbitcoin_la-hash.lo
>>> In file included from src/math/ec_keys.cpp:26:0:
>>> ./include/bitcoin/bitcoin/math/secp256k1_initializer.hpp:38:29: error:
>>> 'secp256k1_context_t' has not been declared
>>>      static void set_context(secp256k1_context_t** context, int flags);
>>>                              ^
>>> ./include/bitcoin/bitcoin/math/secp256k1_initializer.hpp:58:5: error:
>>> 'secp256k1_context_t' does not name a type
>>>      secp256k1_context_t* context();
>>>      ^
>>> ./include/bitcoin/bitcoin/math/secp256k1_initializer.hpp:62:5: error:
>>> 'secp256k1_context_t' does not name a type
>>>      secp256k1_context_t* context_;
>>>      ^
>>> src/math/ec_keys.cpp: In function 'libbitcoin::ec_point
>>> libbitcoin::secret_to_public_key(const ec_secret&, bool)':
>>> src/math/ec_keys.cpp:35:42: error: 'class
>>> libbitcoin::secp256k1_signing' has no member named 'context'
>>>      const auto signing_context = signing.context();
>>>                                           ^
>>> src/math/ec_keys.cpp: In function 'bool
>>> libbitcoin::verify_public_key(const ec_point&)':
>>> src/math/ec_keys.cpp:56:52: error: 'class
>>> libbitcoin::secp256k1_verification' has no member named 'context'
>>>      const auto verification_context = verification.context();
>>>                                                     ^
>>> src/math/ec_keys.cpp:58:49: error: 'secp256k1_ec_pubkey_verify' was
>>> not declared in this scope
>>>          static_cast<uint32_t>(public_key.size())) == 1;
>>>                                                  ^
>>> src/math/ec_keys.cpp: In function 'bool
>>> libbitcoin::verify_private_key(const ec_secret&)':
>>> src/math/ec_keys.cpp:74:52: error: 'class
>>> libbitcoin::secp256k1_verification' has no member named 'context'
>>>      const auto verification_context = verification.context();