diff -r f60e16663f6e Makefile.pre.in
--- a/Makefile.pre.in	Sat Aug 06 13:48:10 2016 -0700
+++ b/Makefile.pre.in	Sun Sep 11 08:20:27 2016 +0200
@@ -719,13 +719,13 @@
 Programs/_freeze_importlib: Programs/_freeze_importlib.o $(LIBRARY_OBJS_OMIT_FROZEN)
 	$(LINKCC) $(PY_LDFLAGS) -o $@ Programs/_freeze_importlib.o $(LIBRARY_OBJS_OMIT_FROZEN) $(LIBS) $(MODLIBS) $(SYSLIBS) $(LDLAST)
 
-Python/importlib_external.h: @GENERATED_COMMENT@ $(srcdir)/Lib/importlib/_bootstrap_external.py Programs/_freeze_importlib
+$(srcdir)/Python/importlib_external.h: @GENERATED_COMMENT@ $(srcdir)/Lib/importlib/_bootstrap_external.py Programs/_freeze_importlib
 	./Programs/_freeze_importlib \
-	    $(srcdir)/Lib/importlib/_bootstrap_external.py Python/importlib_external.h
+	    $(srcdir)/Lib/importlib/_bootstrap_external.py $(srcdir)/Python/importlib_external.h
 
-Python/importlib.h: @GENERATED_COMMENT@ $(srcdir)/Lib/importlib/_bootstrap.py Programs/_freeze_importlib
+$(srcdir)/Python/importlib.h: @GENERATED_COMMENT@ $(srcdir)/Lib/importlib/_bootstrap.py Programs/_freeze_importlib
 	./Programs/_freeze_importlib \
-	    $(srcdir)/Lib/importlib/_bootstrap.py Python/importlib.h
+	    $(srcdir)/Lib/importlib/_bootstrap.py $(srcdir)/Python/importlib.h
 
 
 ############################################################################
@@ -871,7 +871,7 @@
 
 Python/ceval.o: $(OPCODETARGETS_H) $(srcdir)/Python/ceval_gil.h
 
-Python/frozen.o: Python/importlib.h Python/importlib_external.h
+Python/frozen.o: $(srcdir)/Python/importlib.h $(srcdir)/Python/importlib_external.h
 
 Objects/typeobject.o: Objects/typeslots.inc
 Objects/typeslots.inc: $(srcdir)/Include/typeslots.h $(srcdir)/Objects/typeslots.py