Index: CMakeLists.txt
--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -280,9 +280,9 @@ if(NOT CMAKE_BUILD_TYPE)
 endif()
 if(NOT EMSCRIPTEN)
 set(CMAKE_CXX_FLAGS_DEBUG "-O0 -g -Wall -DDEBUG -DTRACE")
-set(CMAKE_CXX_FLAGS_RELEASE "-O2 -Wall -DNDEBUG")
+set(CMAKE_CXX_FLAGS_RELEASE "-Wall -DNDEBUG")
 set(CMAKE_CXX_FLAGS_MINSIZEREL "-Os -Wall")
-set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-Og -g -Wall -DNDEBUG")
+set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-Wall -DNDEBUG")
 endif()
 set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
 
@@ -379,7 +379,7 @@ if(NOT CMAKE_CROSSCOMPILING)
 
 	# SDL
 	if(NOT MSVC_VERSION)
-		find_package(SDL)
+		find_package(SDL2)
 		if(USE_SDL AND (USE_SDL_VERSION EQUAL 1))
 			if(NOT SDL_FOUND)
 				message(FATAL_ERROR "-- Not found SDL")
@@ -421,7 +421,7 @@ if(NOT CMAKE_CROSSCOMPILING)
 
 	# SDL_mixer
 	if(NOT MSVC_VERSION)
-		find_package(SDL_mixer)
+		find_package(SDL2_mixer)
 		if(USE_SDL_MIXER AND (USE_SDL_VERSION EQUAL 1))
 			if(NOT SDL_mixer_FOUND)
 				message(FATAL_ERROR "-- Not found SDL_mixer")
@@ -458,7 +458,7 @@ if(NOT CMAKE_CROSSCOMPILING)
 
 	# SDL_ttf
 	if(NOT MSVC_VERSION)
-		find_package(SDL_ttf)
+		find_package(SDL2_ttf)
 		if(USE_SDL_TTF AND (USE_SDL_VERSION EQUAL 1))
 			if(NOT SDL_ttf_FOUND)
 				message(FATAL_ERROR "-- Not found SDL_ttf")
