Require `Regexp.escape` before interpolating `build_dir`; fix
MODIFY
Rakefile
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

Require `Regexp.escape` before interpolating `build_dir`; fix #4817