Correctly Detect and link SDL2 for linux

src/Joystick/CMakeLists.txt

@@ -26,9 +26,15 @@ target_include_directories(Joystick PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 
 if(LINUX)
         find_package(SDL2 REQUIRED)
-	include_directories(${SDL2_INCLUDE_DIRS})
-	string(STRIP ${SDL2_LIBRARIES} SDL2_LIBRARIES) # work around for cmake warning
-	target_link_libraries(Joystick PRIVATE ${SDL2_LIBRARIES})
+        if (IS_DIRECTORY ${SDL2_INCLUDE_DIRS})
+            include_directories(${SDL2_INCLUDE_DIRS})
+            string(STRIP "${SDL2_LIBRARIES}" SDL2_LIBRARIES)
+            target_link_libraries(Joystick PRIVATE ${SDL2_LIBRARIES})
+        else()
+            include_directories(${SDL2_DIR})
+            target_link_libraries(Joystick PRIVATE SDL2::SDL2)
+        endif()
+
 elseif(APPLE)
         include_directories(${CMAKE_SOURCE_DIR}/libs/lib/Frameworks/SDL2.framework/Headers)
         target_link_libraries(Joystick PRIVATE -F${CMAKE_SOURCE_DIR}/libs/lib/Frameworks "-framework SDL2")