Index: util/cbfstool/Makefile.inc
--- util/cbfstool/Makefile.inc.orig
+++ util/cbfstool/Makefile.inc
@@ -134,7 +134,6 @@ TOOLCPPFLAGS += -I$(top)/src
 TOOLCPPFLAGS += -I$(top)/src/vendorcode/intel/edk2/uefi_2.4/MdePkg/Include
 
 TOOLLDFLAGS ?=
-HOSTCFLAGS += -fms-extensions
 
 ifeq ($(shell uname -s | cut -c-7 2>/dev/null), MINGW32)
 TOOLCFLAGS += -mno-ms-bitfields
