--- a/blitz/CMakeLists.txt
+++ b/blitz/CMakeLists.txt
@@ -31,12 +31,8 @@
 
 if(HAVE_MMX)
     if(NOT APPLE AND NOT WIN32)
+	enable_language(ASM)
         set( blitz_LIB_SRCS ${blitz_LIB_SRCS} asm_scale.S )
-        add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/asm_scale.o
-            COMMAND gcc -c ${CMAKE_CURRENT_SOURCE_DIR}/asm_scale.S
-            DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/asm_scale.S )
-        set( blitz_LIB_EXTRA_SRCS ${CMAKE_CURRENT_BINARY_DIR}/asm_scale.o )
-        set(HAVE_EXTERNAL_ASM TRUE)
     endif(NOT APPLE AND NOT WIN32)
 endif(HAVE_MMX)
 configure_file (config-processor.h.cmake ${CMAKE_CURRENT_BINARY_DIR}/config-processor.h )