From 348d8bdb0edeb4df2ef40379ab579dfc15afc327 Mon Sep 17 00:00:00 2001
From: David Rodriguez <deivid.rodriguez@riseup.net>
Date: Wed, 20 Mar 2024 16:43:26 +0100
Subject: Use `$ext_build_dir` consistently

Instead of hardcoded "ext".
---
 tool/rbinstall.rb | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tool/rbinstall.rb b/tool/rbinstall.rb
index 2faaece8c9..3a36777420 100755
--- a/tool/rbinstall.rb
+++ b/tool/rbinstall.rb
@@ -555,11 +555,17 @@ module RbInstall
       class Ext < self
         def skip_install?(files)
           # install ext only when it's configured
-          !File.exist?("#{$ext_build_dir}/#{relative_base}/Makefile")
+          !File.exist?("#{makefile_dir}/Makefile")
         end
 
         def ruby_libraries
-          Dir.glob("lib/**/*.rb", base: "#{srcdir}/ext/#{relative_base}")
+          Dir.glob("lib/**/*.rb", base: makefile_dir)
+        end
+
+        private
+
+        def makefile_dir
+          File.expand_path("#{$ext_build_dir}/#{relative_base}", srcdir)
         end
       end
 
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