title: gem install t gives "Failed to build gem native extension"
body: <p>I'm trying to gem install t(a command line tool for Twitter) in my OSX High Sierra. My Ruby version is ruby 2.3.7p456. </p>
  
  <p>But I am getting the error below:
      ~> gem install t</p>
  
  <pre><code>Building native extensions.  This could take a while...
  ERROR:  Error installing t:
      ERROR: Failed to build gem native extension.
  
      /Users/akira/.rbenv/versions/2.2.1/bin/ruby -r ./siteconf20181213-96401-3tpab1.rb extconf.rb
  creating Makefile
  
  make "DESTDIR=" clean
  
  make "DESTDIR="
  compiling ryah_http_parser.c
  In file included from ryah_http_parser.c:24:
  In file included from ./ryah_http_parser.h:44:
  In file included from /usr/local/include/stdint.h:59:
  In file included from /usr/local/include/stdint.h:59:
  ....
  /usr/local/include/stdint.h:2:10: error: #include nested too deeply
  #include &lt;stddef.h&gt;
           ^
  /usr/local/include/stdint.h:59:11: error: #include nested too deeply
  # include &lt;stdint.h&gt;
            ^
  /usr/local/include/stdint.h:72:11: error: #include nested too deeply
  # include &lt;sys/types.h&gt;
            ^
  In file included from ryah_http_parser.c:24:
  ./ryah_http_parser.h:210:3: error: unknown type name 'uint64_t'
    uint64_t content_length; /* # bytes in body (0 if no Content-Length header) */
    ^
  In file included from ryah_http_parser.c:28:
  In file included from /usr/include/stdlib.h:65:
  In file included from /usr/include/sys/wait.h:110:
  /usr/include/sys/resource.h:197:2: error: unknown type name 'uint64_t'
          uint64_t ri_user_time;
          ^
  /usr/include/sys/resource.h:198:2: error: unknown type name 'uint64_t'
          uint64_t ri_system_time;
          ^
  /usr/include/sys/resource.h:199:2: error: unknown type name 'uint64_t'
          uint64_t ri_pkg_idle_wkups;
          ^
  fatal error: too many errors emitted, stopping now [-ferror-limit=]
  20 errors generated.
  make: *** [ryah_http_parser.o] Error 1
  
  make failed, exit code 2
  
  Gem files will remain installed in /Users/akira/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/http_parser.rb-0.6.0 for inspection.
  Results logged to /Users/akira/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/extensions/x86_64-darwin-15/2.2.0-static/http_parser.rb-0.6.0/gem_make.out
  </code></pre>
  
  <p>Does anyone have any idea what the problem is here?</p>