System openSSL for linux

ixwebsocket/CMakeLists.txt

@@ -76,12 +76,17 @@ elseif(UNIX)
             -m32
         )
     endif()
+        if (NOT OPENSSL_FOUND)
+      find_package(OpenSSL REQUIRED)
+    endif()
+    message(STATUS "System OpenSSL: " ${OPENSSL_VERSION})
+
+    add_definitions(${OPENSSL_DEFINITIONS})
     target_include_directories(ixwebsocket PRIVATE
-        ${CMAKE_SOURCE_DIR}/openSSL/lin${BIT}/include
+        ${OPENSSL_INCLUDE_DIR}
     )
     target_link_libraries(ixwebsocket PRIVATE
-        ${CMAKE_SOURCE_DIR}/openSSL/lin${BIT}/libcrypto.so.1.1
-        ${CMAKE_SOURCE_DIR}/openSSL/lin${BIT}/libssl.so.1.1
+        ${OPENSSL_LIBRARIES}
         pthread
     )
 elseif(WIN32)