如何修复架构x86_64，Boost Asio 1.58的未定义符号

我正在开发一个需要小型服务器来侦听HTTP请求的小型软件。不幸的是，生产服务器仅使用https，因此请求失败。我在网上搜索并找到了以下示例：http : //www.boost.org/doc/libs/1_65_0/doc/html/boost_asio/example/cpp03/ssl/server.cpp

我尽力应用所需的更改。但是我不能编译它。我在MacOS机器上，但是服务器是Ubuntu服务器。我通过brew安装了OpenSSL。

编译在链接过程中失败：

[ 98%] Linking CXX executable GpdServer
Undefined symbols for architecture x86_64:
  "_ERR_remove_thread_state", referenced from:
      boost::asio::ssl::detail::openssl_init_base::do_init::~do_init() in main.cpp.o
      boost::asio::ssl::detail::openssl_init_base::do_init::~do_init() in TcpServer.cpp.o
      boost::asio::ssl::detail::openssl_init_base::do_init::~do_init() in TcpConnection.cpp.o
  "_TLSv1_1_client_method", referenced from:
      boost::asio::ssl::context::context(boost::asio::ssl::context_base::method) in TcpServer.cpp.o
  "_TLSv1_1_method", referenced from:
      boost::asio::ssl::context::context(boost::asio::ssl::context_base::method) in TcpServer.cpp.o
  "_TLSv1_1_server_method", referenced from:
      boost::asio::ssl::context::context(boost::asio::ssl::context_base::method) in TcpServer.cpp.o
  "_TLSv1_2_client_method", referenced from:
      boost::asio::ssl::context::context(boost::asio::ssl::context_base::method) in TcpServer.cpp.o
  "_TLSv1_2_method", referenced from:
      boost::asio::ssl::context::context(boost::asio::ssl::context_base::method) in TcpServer.cpp.o
  "_TLSv1_2_server_method", referenced from:
      boost::asio::ssl::context::context(boost::asio::ssl::context_base::method) in TcpServer.cpp.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [GpdServer] Error 1
make[1]: *** [CMakeFiles/GpdServer.dir/all] Error 2
make: *** [all] Error 2

导致此问题的TcpConnection文件在此处：https : //github.com/cwansart/gpd/blob/master/src/TcpServer.h https://github.com/cwansart/gpd/blob/master/src/TcpServer .cpp

我的构建系统是CMake。包括它工作正常。

我究竟做错了什么？我该如何解决？