SF patch #524005 by Paul Eggert.

gvanrossum · gvanrossum · commit c948966fc4bc · 2002-02-28T19:26:08.000Z
Use posixly correct sort args.

Bugfix candidate.
diff --git a/Makefile.pre.in b/Makefile.pre.in
@@ -828,7 +828,7 @@ tags::
 	ctags -w -t Include/*.h; \
 	for i in $(SRCDIRS); do ctags -w -t -a $$i/*.[ch]; \
 	done; \
-	sort tags -o tags
+	sort -o tags tags
 
 # Create a tags file for GNU Emacs
 TAGS::
