[PATCH] limit rack version for ruby compatibility

[Adam Duke <adamduke@twitter.com>]

From 6f1cb0ae4b63bd1906fd83d154dae1d1f2b35407 Mon Sep 17 00:00:00 2001
From: Adam Duke <adam.v.duke@gmail.com>
Date: Fri, 8 Jan 2016 13:06:31 -0500
Subject: [PATCH] limit rack version for ruby compatibility

rack introduced a dependency on ruby 2.2.2 or greater in
https://github.com/rack/rack/commit/771d94e5dbe53058160a1f8a4cc56384c1d2a048

In order to maintain support for ruby versions less than 2.2.2, limit
the rack dependency to supported versions for the current ruby.
---
 unicorn.gemspec | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/unicorn.gemspec b/unicorn.gemspec
index 1099361..ce7080a 100644
--- a/unicorn.gemspec
+++ b/unicorn.gemspec
@@ -35,7 +35,11 @@
   # up/downgrade to any other version, the Rack dependency may be
   # commented out.  Nevertheless, upgrading to Rails 2.3.4 or later is
   # *strongly* recommended for security reasons.
-  s.add_dependency(%q<rack>)
+  if RUBY_VERSION < '2.2.2'
+    s.add_dependency(%q<rack>, '~> 1.6.4')
+  else
+    s.add_dependency(%q<rack>)
+  end
   s.add_dependency(%q<kgio>, '~> 2.6')
   s.add_dependency(%q<raindrops>, '~> 0.7')

-- 
2.6.4