diff -Naur Python-3.6.5-orig/Makefile.pre.in Python-3.6.5/Makefile.pre.in
--- Python-3.6.5-orig/Makefile.pre.in	2018-04-16 09:55:06.384441000 +0300
+++ Python-3.6.5/Makefile.pre.in	2018-04-16 09:55:17.048519100 +0300
@@ -106,7 +106,7 @@
 # Extra C flags added for building the interpreter object files.
 CFLAGSFORSHARED=@CFLAGSFORSHARED@
 # C flags used for building the interpreter object files
-PY_CORE_CFLAGS=	$(PY_CFLAGS) $(PY_CFLAGS_NODIST) $(PY_CPPFLAGS) $(CFLAGSFORSHARED) -DPy_BUILD_CORE
+PY_CORE_CFLAGS=	$(PY_CFLAGS) $(PY_CFLAGS_NODIST) $(PY_CPPFLAGS) $(CFLAGSFORSHARED) -DPy_BUILD_CORE -D_WIN32_WINNT=0x0601
 # Strict or non-strict aliasing flags used to compile dtoa.c, see above
 CFLAGS_ALIASING=@CFLAGS_ALIASING@