cmake: Pacify warning about Policy CMP0042 not being set.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 290cf98..7ce3769 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1642,7 +1642,9 @@
 
 if(SDL_SHARED)
   add_library(SDL2 SHARED ${SOURCE_FILES} ${VERSION_SOURCES})
-  if(UNIX AND NOT ANDROID)
+  if(APPLE)
+    set_target_properties(SDL2 PROPERTIES MACOSX_RPATH 1)
+  elseif(UNIX AND NOT ANDROID)
     set_target_properties(SDL2 PROPERTIES
       VERSION ${LT_VERSION}
       SOVERSION ${LT_REVISION}