diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 765114b38..ffeba6d49 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -705,6 +705,25 @@ else()
 	set( OTHER_SYSTEM_SOURCES ${PLAT_WIN32_SOURCES} ${PLAT_OSX_SOURCES} ${PLAT_COCOA_SOURCES} )
 endif()
 
+if( HAVE_MMX )
+	add_definitions( -DHAVE_MMX=1 )
+
+	set( SYSTEM_SOURCES ${SYSTEM_SOURCES}
+		gl/hqnx_asm/hq2x_asm.cpp
+		gl/hqnx_asm/hq3x_asm.cpp
+		gl/hqnx_asm/hq4x_asm.cpp
+		gl/hqnx_asm/hqnx_asm_Image.cpp)
+
+	if( ZD_CMAKE_COMPILER_IS_GNUCXX_COMPATIBLE )
+		set_source_files_properties(
+			gl/hqnx_asm/hq2x_asm.cpp
+			gl/hqnx_asm/hq3x_asm.cpp
+			gl/hqnx_asm/hq4x_asm.cpp
+			gl/textures/gl_hqresize.cpp
+			PROPERTIES COMPILE_FLAGS "-mmmx" )
+	endif( ZD_CMAKE_COMPILER_IS_GNUCXX_COMPATIBLE )
+endif( HAVE_MMX )
+
 add_custom_command( OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/xlat_parser.c ${CMAKE_CURRENT_BINARY_DIR}/xlat_parser.h
 	COMMAND lemon -C${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/xlat/xlat_parser.y
 	DEPENDS lemon ${CMAKE_CURRENT_SOURCE_DIR}/xlat/xlat_parser.y )