https://git.ruby-lang.org/ruby.git/commit/?id=7f3c5e65c6

From 7f3c5e65c658ba164bbf0ca7df18ac5b0c8be573 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 14 Jan 2021 00:17:23 +0900
Subject: mkmf.rb: remove exts.mk at distclean


diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 488f787..9d25cc6 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -2770,7 +2770,7 @@ distclean-rb:: https://github.com/ruby/ruby/blob/trunk/lib/mkmf.rb#L2770
 distclean-so::
 distclean-static::
 distclean: clean distclean-so distclean-static distclean-rb-default distclean-rb
-\t\t-$(Q)$(RM) Makefile $(RUBY_EXTCONF_H) #{CONFTEST}.* mkmf.log
+\t\t-$(Q)$(RM) Makefile $(RUBY_EXTCONF_H) #{CONFTEST}.* mkmf.log#{' exts.mk' if $extmk}
 \t\t-$(Q)$(RM) core ruby$(EXEEXT) *~ $(DISTCLEANFILES#{sep})
 \t\t-$(Q)$(RMDIRS) $(DISTCLEANDIRS#{sep})#{$ignore_error}
 
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