From d69249d0ff210316121b44d971ddd2439b1bc393 Mon Sep 17 00:00:00 2001
From: zimbatm <zimbatm@zimbatm.com>
Date: Wed, 21 Sep 2016 09:40:39 +0100
Subject: [PATCH 3/3] gem install default to user

Default to not installing gems to the read-only system derivation.
---
 lib/rubygems/path_support.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/rubygems/path_support.rb b/lib/rubygems/path_support.rb
index ed680d65..749b9ea6 100644
--- a/lib/rubygems/path_support.rb
+++ b/lib/rubygems/path_support.rb
@@ -23,7 +23,7 @@ class Gem::PathSupport
   # hashtable, or defaults to ENV, the system environment.
   #
   def initialize(env)
-    @home = env["GEM_HOME"] || Gem.default_dir
+    @home = env["GEM_HOME"] || Gem.user_dir
 
     if File::ALT_SEPARATOR
       @home = @home.gsub(File::ALT_SEPARATOR, File::SEPARATOR)
-- 
2.21.0