diff -Naur Python-3.5.0-orig/Modules/_ctypes/libffi/fficonfig.py.in Python-3.5.0/Modules/_ctypes/libffi/fficonfig.py.in
--- Python-3.5.0-orig/Modules/_ctypes/libffi/fficonfig.py.in	2015-09-13 14:41:24.000000000 +0300
+++ Python-3.5.0/Modules/_ctypes/libffi/fficonfig.py.in	2015-09-21 13:41:58.520304800 +0300
@@ -23,6 +23,7 @@
     'FRV': ['src/frv/eabi.S', 'src/frv/ffi.c'],
     'S390': ['src/s390/sysv.S', 'src/s390/ffi.c'],
     'X86_64': ['src/x86/ffi64.c', 'src/x86/unix64.S', 'src/x86/ffi.c', 'src/x86/sysv.S'],
+    'X86_WIN64': ['src/x86/ffi.c', 'src/x86/win64.S'],
     'SH': ['src/sh/sysv.S', 'src/sh/ffi.c'],
     'SH64': ['src/sh64/sysv.S', 'src/sh64/ffi.c'],
     'PA': ['src/pa/linux.S', 'src/pa/ffi.c'],
@@ -30,6 +31,9 @@
     'PA_HPUX': ['src/pa/hpux32.S', 'src/pa/ffi.c'],
 }
 
+ffi_target = '@TARGET@'
+if ffi_target not in ['X86_WIN32', 'X86_WIN64']:
+    ffi_sources += 'src/dlmalloc.c'
 ffi_sources += ffi_platforms['@TARGET@']
 
 ffi_cflags = '@CFLAGS@'
diff -Naur Python-3.5.0-orig/setup.py Python-3.5.0/setup.py
--- Python-3.5.0-orig/setup.py	2015-09-21 13:41:50.381810900 +0300
+++ Python-3.5.0/setup.py	2015-09-21 13:41:58.521433600 +0300
@@ -1908,6 +1908,10 @@
         return True
 
     def configure_ctypes(self, ext):
+        if host_platform == 'win32':
+            ext.libraries.extend(['ole32', 'oleaut32', 'uuid'])
+            ext.export_symbols.extend(['DllGetClassObject PRIVATE',
+                                       'DllCanUnloadNow PRIVATE'])
         if not self.use_system_libffi:
             if host_platform == 'darwin':
                 return self.configure_ctypes_darwin(ext)
@@ -1932,6 +1936,10 @@
                 if not self.verbose:
                     config_args.append("-q")
 
+                if host_platform == 'win32':
+                    table = str.maketrans('\\', '/')
+                    ffi_builddir = ffi_builddir.translate(table)
+                    ffi_srcdir = ffi_srcdir.translate(table)
                 # Pass empty CFLAGS because we'll just append the resulting
                 # CFLAGS to Python's; -g or -O2 is to be avoided.
                 cmd = "cd %s && env CFLAGS='' '%s/configure' %s" \