https://git.ruby-lang.org/ruby.git/commit/?id=a042043487

From a042043487eb4c7d39307b8e784ede1856455c3e Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 27 Dec 2020 20:33:20 +0900
Subject: Do not include external library sources into packages


diff --git a/common.mk b/common.mk
index 7633050..20c6de7 100644
--- a/common.mk
+++ b/common.mk
@@ -1282,8 +1282,9 @@ up:: https://github.com/ruby/ruby/blob/trunk/common.mk#L1282
 yes::
 no::
 
+EXTRACT_EXTLIBS = extract-extlibs
 after-update:: $(REVISION_H)
-after-update:: extract-extlibs
+after-update:: $(EXTRACT_EXTLIBS)
 after-update:: extract-gems
 
 update-remote:: update-src update-download
diff --git a/tool/make-snapshot b/tool/make-snapshot
index 131d7b9..869eb29 100755
--- a/tool/make-snapshot
+++ b/tool/make-snapshot
@@ -463,6 +463,7 @@ def package(vcs, rev, destdir, tmp = nil) https://github.com/ruby/ruby/blob/trunk/tool/make-snapshot#L463
       end
       vars.delete("UNICODE_FILES") # for stable branches
       vars["UNICODE_VERSION"] = $unicode_version if $unicode_version
+      vars["EXTRACT_EXTLIBS"] = ""
       args = vars.dup
       mk.gsub!(/@([A-Za-z_]\w*)@/) {args.delete($1); vars[$1] || ENV[$1]}
       mk << commonmk.gsub(/\{\$([^(){}]*)[^{}]*\}/, "").sub(/^revision\.tmp::$/, '\& Makefile')
-- 
cgit v0.10.2


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