--- a/CMakeLists.txt

+++ b/CMakeLists.txt

@@ -107,7 +107,12 @@ list(APPEND MLT_COMPILE_OPTIONS "")

 # MSVC cl doesn't support GNU inline assembly (but MSVC-compatible clang-cl does)

 if(CMAKE_C_COMPILER_ID MATCHES "GNU|Clang")

-  if(CMAKE_SYSTEM_PROCESSOR MATCHES "i686|x86|x86_64|AMD64")

+  if(CMAKE_SYSTEM_PROCESSOR MATCHES "i686|x86")

+    set(CPU_MMX OFF)

+    set(CPU_SSE OFF)

+    set(CPU_SSE2 OFF)

+  endif()

+  if(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64|AMD64")

     set(CPU_MMX ON)

     set(CPU_SSE ON)

     set(CPU_SSE2 ON)