Sjoerd Mullender writes:

gvanrossum · gvanrossum · commit 9819e4c5cf30 · 1998-12-09T17:05:33.000Z
The example Makefile.pre.in should also look at Setup.thread and
Setup.local.  Otherwise modules such as thread don't get incorporated
in extensions.
diff --git a/Misc/Makefile.pre.in b/Misc/Makefile.pre.in
@@ -168,7 +168,7 @@ MAKESETUP=	$(LIBPL)/makesetup
 MAKEFILE=	$(LIBPL)/Makefile
 CONFIGC=	$(LIBPL)/config.c
 CONFIGCIN=	$(LIBPL)/config.c.in
-SETUP=		$(LIBPL)/Setup
+SETUP=		$(LIBPL)/Setup.thread $(LIBPL)/Setup.local $(LIBPL)/Setup
 
 SYSLIBS=	$(LIBM) $(LIBC)
 
