--- CMakeLists.txt.orig	2024-03-27 17:04:02 UTC
+++ CMakeLists.txt
@@ -776,7 +776,7 @@ IF (WITH_FUSION)
 IF (WITH_FUSION)
     SET(STANDALONE_COMPILE_FLAGS "${STANDALONE_COMPILE_FLAGS} -DH2O_USE_FUSION=1")
     LIST(APPEND STANDALONE_SOURCE_FILES deps/picotls/lib/fusion.c)
-    SET_SOURCE_FILES_PROPERTIES(deps/picotls/lib/fusion.c PROPERTIES COMPILE_FLAGS "-mavx2 -maes -mpclmul -mvaes -mvpclmulqdq")
+    SET_SOURCE_FILES_PROPERTIES(deps/picotls/lib/fusion.c PROPERTIES COMPILE_FLAGS "")
 ENDIF ()
 IF (WITH_KTLS)
     SET(STANDALONE_COMPILE_FLAGS "${STANDALONE_COMPILE_FLAGS} -DH2O_USE_KTLS=1")