>>   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();