nixpkgs/pkgs/development/interpreters/ruby/rubygems/0002-binaries-with-env-shebang.patch

From 2e1328bcdddd35e557eabdff83ac07f3591dc693 Mon Sep 17 00:00:00 2001
From: zimbatm <zimbatm@zimbatm.com>
Date: Wed, 21 Sep 2016 19:37:05 +0100
Subject: [PATCH 2/3] binaries with env shebang

By default, don't point to the absolute ruby derivation path. As a user
installing a gem in the home, it would freeze the selected ruby version
to the currently-installed ruby derivation.
---
 lib/rubygems/dependency_installer.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/rubygems/dependency_installer.rb b/lib/rubygems/dependency_installer.rb
index 34620860..00ab31d9 100644
--- a/lib/rubygems/dependency_installer.rb
+++ b/lib/rubygems/dependency_installer.rb
@@ -18,7 +18,7 @@ class Gem::DependencyInstaller
   extend Gem::Deprecate
 
   DEFAULT_OPTIONS = { # :nodoc:
-    :env_shebang         => false,
+    :env_shebang         => true,
     :document            => %w[ri],
     :domain              => :both, # HACK dup
     :force               => false,
-- 
2.21.0