Screen display requires directive __USE_SDL to be defined

[Jaeseok Kim]

aal@aal-ThinkPad-S5-S540:~/Downloads/dqn-in-the-caffe-master$ ./dqn -gui
A.L.E: Arcade Learning Environment (version 0.5.1)
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Use -help for help screen.
Game console created:
ROM file: breakout.bin
Cart Name: Breakout - Breakaway IV (1978) (Atari)
Cart MD5: f34f08e5eb96e500e851a80be3277a56
Display Format: AUTO-DETECT ==> NTSC
ROM Size: 2048
Bankswitch Type: AUTO-DETECT ==> 2K

Screen display requires directive __USE_SDL to be defined. Please recompile with flag '-D__USE_SDL'. See makefile for more information.

My CMakeLists.txt
cmake_minimum_required (VERSION 2.6)
project(dqn)

option(CPU_ONLY "Use CPU only for Caffe" ON)
option(USE_CUDNN "Use cuDNN for Caffe" OFF)
option(USE_SDL "Use SDL for ALE" ON)

include_directories(/home/aal/Downloads/dqn-in-the-caffe-master/caffe/distribute/include)
include_directories(/home/aal/Downloads/Arcade-Learning-Environment-master/src)
include_directories(/usr/include/SDL)
link_directories(/home/aal/Downloads/dqn-in-the-caffe-master/caffe/build/lib)
link_directories(/home/aal/Downloads/Arcade-Learning-Environment-master/build/CMakeFiles)
if(USE_CUDNN)
link_directories(~/cudnn-6.5-linux-R1)
endif()

add_executable(dqn dqn_main.cpp dqn.cpp)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -O3 -march=native")

target_link_libraries(dqn caffe)
target_link_libraries(dqn glog)
target_link_libraries(dqn gflags)
target_link_libraries(dqn ale)
target_link_libraries(dqn /usr/local/lib/libale.so)

if(APPLE)
include_directories(/System/Library/Frameworks/vecLib.framework/Versions/Current/Headers)
endif()

if(USE_SDL)
add_definitions(-D__USE_SDL)
if(APPLE)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -framework Cocoa")
target_link_libraries(dqn sdl)
target_link_libraries(dqn sdl_gfx)
target_link_libraries(dqn sdl_image)
target_link_libraries(dqn sdlmain)
else()
target_link_libraries(dqn SDL)
target_link_libraries(dqn SDL_gfx)
target_link_libraries(dqn SDL_image)
target_link_libraries(dqn SDLmain)
endif()
endif()

if(NOT CPU_ONLY)
include_directories(/usr/local/cuda-6.5/targets/x86_64-linux/include)
endif()

if(CPU_ONLY)
add_definitions(-DCPU_ONLY)
endif()

if(USE_CUDNN)
target_link_libraries(dqn cudnn)
endif()

Any help?
Thank you in advance