fixed SDL2_LIBRARY -> SDL2_LIBRARIES

dependencies/CMakeLists.txt

@@ -49,14 +49,16 @@ if(MIRRAGE_PREFER_SYSTEM_SDL)
 
 			if(EXISTS ${SDL2_INCLUDE_DIR}/SDL.h)
 				add_library(mirrage::deps::SDL2 INTERFACE IMPORTED GLOBAL)
-				set_property(TARGET mirrage::deps::SDL2 PROPERTY INTERFACE_LINK_LIBRARIES ${SDL2_LIBRARY})
+				set_property(TARGET mirrage::deps::SDL2 PROPERTY INTERFACE_LINK_LIBRARIES ${SDL2_LIBRARIES})
 				set_property(TARGET mirrage::deps::SDL2 PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${SDL2_INCLUDE_DIR})
+				message("Generated SDL2 target: ${SDL2_LIBRARIES}; ${SDL2_INCLUDE_DIR}")
 			endif()
 		endif()
 	endif()
 endif()
 
 if(NOT TARGET mirrage::deps::SDL2)
+	message("Building SDL2 from source")
 	add_subdirectory(SDL)
 	add_library(mirrage::deps::SDL2 ALIAS SDL2-static)
 	add_library(mirrage::deps::SDL2main ALIAS SDL2main)