title: Unable to install json 1.8.3 in ruby 2.2.1
body: <p>I am running <code>bundle install</code> in <code>Ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-linux]</code> (installed with rvm 1.25.33) and <code>bundler 1.10.6</code></p>
  
  <p>When it tries to install json 1.8.3, I get the following:</p>
  
  <pre><code>Installing json 1.8.3 with native extensions
  
  Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
  
  /home/andrew/.rvm/rubies/ruby-2.2.1/bin/ruby -r ./siteconf20150905-31357-cgs3dn.rb extconf.rb
  creating Makefile
  
  make "DESTDIR=" clean
  
  make "DESTDIR="
  compiling generator.c
  linking shared-object json/ext/generator.so
  
  make "DESTDIR=" install
  ./install -m 0755 generator.so ./.gem.20150905-31357-199esvy/json/ext
  make: ./install: Command not found
  make: *** [install-so] Error 127
  
  make install failed, exit code 2
  </code></pre>
  
  <p>On the same host, I am able to install json 1.8.3 in ruby 2.1.3.</p>
  
  <p>In <a href="https://stackoverflow.com/questions/17444777/make-install-command-not-found">another SO question</a> I see the suggestion to make sure that <code>install</code> is available. I get valid output when I do <code>install --help</code>.</p>
  
  <p>What should I do? Why is the gem able to install in 2.1.3 and not 2.2.1?</p>