https://git.ruby-lang.org/ruby.git/commit/?id=0b2fc4cf37

From 0b2fc4cf379dec82290c5bc9cc71ce8dc4e4f28b Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 23 May 2020 14:56:13 +0900
Subject: extlibs.rb: make symlink only if the target exists


diff --git a/tool/extlibs.rb b/tool/extlibs.rb
index 33462ce..720f1c7 100755
--- a/tool/extlibs.rb
+++ b/tool/extlibs.rb
@@ -99,6 +99,7 @@ class ExtLibs https://github.com/ruby/ruby/blob/trunk/tool/extlibs.rb#L99
     if (target = src).start_with?("/")
       target = File.join([".."] * file.count("/"), src)
     end
+    return unless File.exist?(File.expand_path(target, File.dirname(file)))
     File.unlink(file) rescue nil
     begin
       File.symlink(target, file)
-- 
cgit v0.10.2


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