diff -Naur Python-3.8.0-orig/Makefile.pre.in Python-3.8.0/Makefile.pre.in
--- Python-3.8.0-orig/Makefile.pre.in	2019-10-22 10:03:21.368190400 +0300
+++ Python-3.8.0/Makefile.pre.in	2019-10-22 10:03:31.336607900 +0300
@@ -710,20 +710,20 @@
 
 Programs/_freeze_importlib.o: Programs/_freeze_importlib.c Makefile
 
-Programs/_freeze_importlib: Programs/_freeze_importlib.o $(LIBRARY_OBJS_OMIT_FROZEN)
+Programs/_freeze_importlib$(EXE): Programs/_freeze_importlib.o $(LIBRARY_OBJS_OMIT_FROZEN)
 	$(LINKCC) $(PY_CORE_LDFLAGS) -o $@ Programs/_freeze_importlib.o $(LIBRARY_OBJS_OMIT_FROZEN) $(LIBS) $(MODLIBS) $(SYSLIBS)
 
 .PHONY: regen-importlib
-regen-importlib: Programs/_freeze_importlib
+regen-importlib: Programs/_freeze_importlib$(EXE)
 	# Regenerate Python/importlib_external.h
 	# from Lib/importlib/_bootstrap_external.py using _freeze_importlib
-	./Programs/_freeze_importlib importlib._bootstrap_external \
+	./Programs/_freeze_importlib$(EXE) importlib._bootstrap_external \
 	    $(srcdir)/Lib/importlib/_bootstrap_external.py \
 	    $(srcdir)/Python/importlib_external.h.new
 	$(UPDATE_FILE) $(srcdir)/Python/importlib_external.h $(srcdir)/Python/importlib_external.h.new
 	# Regenerate Python/importlib.h from Lib/importlib/_bootstrap.py
 	# using _freeze_importlib
-	./Programs/_freeze_importlib importlib._bootstrap \
+	./Programs/_freeze_importlib$(EXE) importlib._bootstrap \
 	    $(srcdir)/Lib/importlib/_bootstrap.py \
 	    $(srcdir)/Python/importlib.h.new
 	$(UPDATE_FILE) $(srcdir)/Python/importlib.h $(srcdir)/Python/importlib.h.new
@@ -1781,7 +1781,7 @@
 	find build -name '*.py[co]' -exec rm -f {} ';' || true
 	-rm -f pybuilddir.txt
 	-rm -f Lib/lib2to3/*Grammar*.pickle
-	-rm -f Programs/_testembed Programs/_freeze_importlib
+	-rm -f Programs/_testembed Programs/_freeze_importlib$(EXE)
 	-find build -type f -a ! -name '*.gc??' -exec rm -f {} ';'
 	-rm -f Include/pydtrace_probes.h
 	-rm -f profile-gen-stamp
diff -Naur Python-3.8.0-orig/Programs/_freeze_importlib.c Python-3.8.0/Programs/_freeze_importlib.c
--- Python-3.8.0-orig/Programs/_freeze_importlib.c	2019-10-14 16:34:47.000000000 +0300
+++ Python-3.8.0/Programs/_freeze_importlib.c	2019-10-22 10:03:31.757808700 +0300
@@ -20,7 +20,7 @@
     {0, 0, 0} /* sentinel */
 };
 
-#ifndef MS_WINDOWS
+#ifndef _MSC_VER
 /* On Windows, this links with the regular pythonXY.dll, so this variable comes
    from frozen.obj. In the Makefile, frozen.o is not linked into this executable,
    so we define the variable here. */