https://git.ruby-lang.org/ruby.git/commit/?id=f07a2613e3

From f07a2613e3f14ab713bc5ab88541101bc02a8e38 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Tue, 8 Feb 2022 14:32:40 +0900
Subject: Support directory layout of ruby/ruby repository

---
 lib/ipaddr.gemspec | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/lib/ipaddr.gemspec b/lib/ipaddr.gemspec
index 352570a213..1f4798e43a 100644
--- a/lib/ipaddr.gemspec
+++ b/lib/ipaddr.gemspec
@@ -1,9 +1,17 @@ https://github.com/ruby/ruby/blob/trunk/lib/ipaddr.gemspec#L1
 # frozen_string_literal: true
 # coding: utf-8
-lib = File.expand_path("../lib", __FILE__)
-$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
-version = File.foreach(File.expand_path("ipaddr.rb", lib)).find do |line|
+if File.exist?(File.expand_path("ipaddr.gemspec"))
+  lib = File.expand_path("../lib", __FILE__)
+  $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+
+  file = File.expand_path("ipaddr.rb", lib)
+else
+  # for ruby-core
+  file = File.expand_path("../ipaddr.rb", __FILE__)
+end
+
+version = File.foreach(file).find do |line|
   /^\s*VERSION\s*=\s*["'](.*)["']/ =~ line and break $1
 end
 
-- 
cgit v1.2.1


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