环境
ubuntu 16.04
openssl相关依赖是apt安装的：
CMakeLists.txt 内容
#[[
If you are on Ubuntu, you may install openssl related libs via:
sudo apt install openssl libssl-dev
##]]
cmake_minimum_required(VERSION 3.14)
project(openssl_example)
find_package(OpenSSL REQUIRED)
add_executable(client ssl-client.c)
add_executable(server ssl-server.c)
add_executable(man_in_middle SSL_man_in_middle.c)
set(DEP_LIBS
OpenSSL::Crypto OpenSSL::SSL # modern
#${OPENSSL_SSL_LIBRARY} ${OPENSSL_CRYPTO_LIBRARY} # old style
)
target_link_libraries(client ${DEP_LIBS})
target_link_libraries(server ${DEP_LIBS})
target_link_libraries(man_in_middle ${DEP_LIBS})
