https://git.ruby-lang.org/ruby.git/commit/?id=1b377b32c8

From 1b377b32c8616f85c0a97e68758c5c2db83f2169 Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Thu, 28 Jan 2021 18:23:13 +0900
Subject: Add fallback when PWD is not set

---
 spec/bundler/runtime/setup_spec.rb | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/spec/bundler/runtime/setup_spec.rb b/spec/bundler/runtime/setup_spec.rb
index 09430d6..e2bed00 100644
--- a/spec/bundler/runtime/setup_spec.rb
+++ b/spec/bundler/runtime/setup_spec.rb
@@ -1340,8 +1340,12 @@ end https://github.com/ruby/ruby/blob/trunk/spec/bundler/runtime/setup_spec.rb#L1340
       # override the default gem.
       def load_path_exclusions_hack_for(name)
         if ruby_core?
-          # .ext/common is relative from build directory
-          ext_folder = Pathname(ENV["PWD"]) + ".ext/common"
+          if ENV.key?("PWD")
+            # .ext/common is relative from build directory
+            ext_folder = Pathname(ENV["PWD"]) + ".ext/common"
+          else
+            ext_folder = source_root.join(".ext/common")
+          end
           require_name = name.tr("-", "/")
           if File.exist?(ext_folder.join("#{require_name}.rb"))
             { :exclude_from_load_path => ext_folder.to_s }
-- 
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