https://git.ruby-lang.org/ruby.git/commit/?id=487d96c6b1

From 487d96c6b1cd7f5d415dba27a9684b30dfa9afed Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Sat, 3 Aug 2019 20:37:51 +0900
Subject: [ruby/date] Use Gemfile instead of
 Gem::Specification#add_development_dependency.

https://github.com/ruby/date/commit/13c94362c2

diff --git a/ext/date/date.gemspec b/ext/date/date.gemspec
index ddb9608..5cc2afb 100644
--- a/ext/date/date.gemspec
+++ b/ext/date/date.gemspec
@@ -18,6 +18,4 @@ Gem::Specification.new do |s| https://github.com/ruby/ruby/blob/trunk/ext/date/date.gemspec#L18
   s.email = [nil]
   s.homepage = "https://github.com/ruby/date"
   s.license = "BSD-2-Clause"
-
-  s.add_development_dependency "rake-compiler"
 end
-- 
cgit v0.10.2


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