From 967c31178dcdb5336f793e00b892492ac9b7573e Mon Sep 17 00:00:00 2001
From: Kazuki Yamaguchi <k@rhe.jp>
Date: Tue, 11 Jul 2017 15:05:02 +0900
Subject: Rakefile: install_dependencies: install only when needed

Emulate the behavior of 'gem install --conservative'. This would prevent
overwriting the existing Rake installation.
---
 Rakefile | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Rakefile b/Rakefile
index 2fca743d..3350157b 100644
--- a/Rakefile
+++ b/Rakefile
@@ -34,8 +34,13 @@ task :install_dependencies do
   gemspec = eval(File.read("openssl.gemspec"))
   gemspec.development_dependencies.each do |dep|
     print "Installing #{dep.name} (#{dep.requirement}) ... "
-    gem = Gem.install(dep.name, dep.requirement, force: true)
-    puts "#{gem[0].version}"
+    installed = dep.matching_specs
+    if installed.empty?
+      installed = Gem.install(dep.name, dep.requirement)
+      puts "#{installed[0].version}"
+    else
+      puts "(found #{installed[0].version})"
+    end
   end
 end
 
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