c3-lang/libffi

diff --git a/configure.host b/configure.host
index 36ffbb8..4062a48 100644
--- a/configure.host
+++ b/configure.host
@@ -64,8 +64,8 @@ case "${host}" in
 	TARGET=X86_FREEBSD; TARGETDIR=x86
 	;;
 
-  i?86-win32* | i?86-*-cygwin* | i?86-*-mingw* | i?86-*-os2* | i?86-*-interix* \
-  | x86_64-*-cygwin* | x86_64-*-mingw* | x86_64-*-winnt* )
+  i?86-*-cygwin* | i?86-*-mingw* | i?86-*-os2* | i?86-*-interix* \
+  | x86_64-*-cygwin* | x86_64-*-mingw* | x86_64-*-win* )
 	TARGETDIR=x86
 	if test $ac_cv_sizeof_size_t = 4; then
 	  TARGET=X86_WIN32
@@ -73,7 +73,13 @@ case "${host}" in
 	  TARGET=X86_WIN64
 	fi
 	if test "${ax_cv_c_compiler_vendor}" = "microsoft"; then
-		MSVC=1
+	  MSVC=1
+	  if test $ac_cv_sizeof_size_t = 4; then
+	    # libffi does not support microsoft tools for 32-bit windows
+	    # hosts.  Try porting src/x86/sysv.S to intel assembly
+	    # format.
+	    UNSUPPORTED=1
+          fi
 	fi
 	# All mingw/cygwin/win32 builds require -no-undefined for sharedlib.
 	# We must also check with_cross_host to decide if this is a native