M CMakeLists.txt → CMakeLists.txt

@@ -747,8 +747,11 @@ install(TARGETS ${BINARY_NAME}-openemu LIBRARY DESTINATION ${OE_LIBDIR} COMPONENT ${BINARY_NAME}.oecoreplugin NAMELINK_SKIP)
 endif()
 
 if(BUILD_SDL)
-	add_definitions(-DBUILD_SDL)
 	add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/src/platform/sdl ${CMAKE_CURRENT_BINARY_DIR}/sdl)
+	# The SDL platform CMakeLists could decide to disable SDL, so check again before adding the define.
+	if(BUILD_SDL)
+		add_definitions(-DBUILD_SDL)
+	endif()
 endif()
 
 if(BUILD_QT)

M src/platform/sdl/CMakeLists.txt → src/platform/sdl/CMakeLists.txt

@@ -24,6 +24,8 @@ set(BUILD_SDL OFF PARENT_SCOPE)
 	return()
 endif()
 
+add_definitions(-DBUILD_SDL)
+
 find_feature(USE_PIXMAN "pixman-1")
 if(USE_PIXMAN)
 	add_definitions(-DUSE_PIXMAN)