CMakeLists.txt: improve asio detection

Author: jg1uaa

CMakeLists.txt

@@ -59,10 +59,11 @@ if(USE_SUBMODULES)
         ${CMAKE_CURRENT_LIST_DIR}/lib/asio/asio/include
     )
 else()
+    find_package(PkgConfig REQUIRED)
     find_package(websocketpp CONFIG REQUIRED)
-    find_package(asio CONFIG REQUIRED)
+    pkg_check_modules(ASIO required asio)
     find_package(RapidJSON CONFIG REQUIRED)
-    target_link_libraries(sioclient PRIVATE websocketpp::websocketpp asio::asio rapidjson)
+    target_include_directories(sioclient PRIVATE ${WEBSOCKETPP_INCLUDE_DIR} ${ASIO_INCLUDE_DIRS} ${RapidJSON_INCLUDE_DIR})
 endif()
 
 include(GNUInstallDirs)
@@ -105,7 +106,7 @@ if(OPENSSL_FOUND)
     target_compile_features(sioclient_tls PUBLIC cxx_std_11)
     target_link_libraries(sioclient_tls PRIVATE OpenSSL::SSL OpenSSL::Crypto)
     if (NOT USE_SUBMODULES)
-        target_link_libraries(sioclient_tls PRIVATE websocketpp::websocketpp asio asio::asio rapidjson)
+        target_include_directories(sioclient_tls PRIVATE ${WEBSOCKETPP_INCLUDE_DIR} ${ASIO_INCLUDE_DIRS} ${RapidJSON_INCLUDE_DIR})
     endif()
 
     target_compile_definitions(sioclient_tls PRIVATE -DSIO_TLS)