From c268e36e44e60449365cc11a4087c1c1d3b13a1d Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Mon, 11 Nov 2019 18:12:34 +0900
Subject: Require `Regexp.escape` before interpolating `build_dir`; fix #4817

---
 Rakefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Rakefile b/Rakefile
index 28e2d75c8..69c7d4c89 100644
--- a/Rakefile
+++ b/Rakefile
@@ -62,7 +62,7 @@ MRuby.each_target do |target|
     relative_from_root = gem.dir.relative_path_from(MRUBY_ROOT)
     current_build_dir = File.expand_path "#{build_dir}/#{relative_from_root}"
 
-    if current_build_dir !~ /^#{build_dir}/
+    if current_build_dir !~ /^#{Regexp.escape(build_dir)}/
       current_build_dir = "#{build_dir}/mrbgems/#{gem.name}"
     end
 
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