title: ERROR: Error installing oj:
body: <p>I just cloned a repository from GitHub for the first time.</p>
  
  <p>I went to check it out on my local machine, so within the local repository on my mac I ran the following command</p>
  
  <p>bin/rails server</p>
  
  <p>I got the following error:</p>
  
  <p>Could not find activesupport-5.0.0.1 in any of the sources
  Run <code>bundle install</code> to install missing gems.</p>
  
  <p>So I then ran the bundle install command as suggested, but then it gave me the following error</p>
  
  <p>An error occurred while installing oj (2.12.14), and Bundler cannot continue.
  Make sure that <code>gem install oj -v '2.12.14'</code> succeeds before bundling.</p>
  
  <p>So as suggested I ran: gem install oj -v '2.12.14'</p>
  
  <p>Then I got a really long message with warning and an error (see below). Any thoughts?</p>
  
  <pre><code>ERROR:  Error installing oj:
  ERROR: Failed to build gem native extension.
  
      current directory: /usr/local/lib/ruby/gems/2.4.0/gems/oj-2.12.14/ext/oj
  
  /usr/local/opt/ruby/bin/ruby -r ./siteconf20170218-3717-1p2bvl9.rb extconf.rb
  
  &gt;&gt;&gt;&gt;&gt; Creating Makefile for ruby version 2.4.0 on x86_64-darwin16 &lt;&lt;&lt;&lt;&lt;
  
  creating Makefile
  
  
  
  current directory: /usr/local/lib/ruby/gems/2.4.0/gems/oj-2.12.14/ext/oj
  
  make "DESTDIR=" clean
  
  
  
  current directory: /usr/local/lib/ruby/gems/2.4.0/gems/oj-2.12.14/ext/oj
  
  make "DESTDIR="
  
  compiling cache8.c
  
  compiling circarray.c
  
  compiling compat.c
  
  compiling dump.c
  
  dump.c:503:8: warning: implicit conversion loses integer precision: 'long' to 'int' [-Wshorten-64-to-32]
  
          cnt = RSTRING_LEN(rstr);
  
              ~ ^~~~~~~~~~~~~~~~~
  
  /usr/local/Cellar/ruby/2.4.0/include/ruby-2.4.0/ruby/ruby.h:976:6: note: expanded from macro 'RSTRING_LEN'
  
       RSTRING_EMBED_LEN(str) : \
  
       ^~~~~~~~~~~~~~~~~~~~~~
  
  /usr/local/Cellar/ruby/2.4.0/include/ruby-2.4.0/ruby/ruby.h:972:6: note: expanded from macro 'RSTRING_EMBED_LEN'
  
       (long)((RBASIC(str)-&gt;flags &gt;&gt; RSTRING_EMBED_LEN_SHIFT) &amp; \
  
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
  dump.c:503:8: warning: implicit conversion loses integer precision: 'long' to 'int' [-Wshorten-64-to-32]
  
          cnt = RSTRING_LEN(rstr);
  
              ~ ^~~~~~~~~~~~~~~~~
  
  /usr/local/Cellar/ruby/2.4.0/include/ruby-2.4.0/ruby/ruby.h:977:28: note: expanded from macro 'RSTRING_LEN'
  
       RSTRING(str)-&gt;as.heap.len)
  
       ~~~~~~~~~~~~~~~~~~~~~~^~~
  
  dump.c:1776:39: warning: 'rb_struct_ptr' is deprecated [-Wdeprecated-declarations]
  
          for (i = (int)RSTRUCT_LEN(obj), vp = RSTRUCT_PTR(obj); 0 &lt; i; i--, vp++) {
  
                                               ^
  
  /usr/local/Cellar/ruby/2.4.0/include/ruby-2.4.0/ruby/ruby.h:1190:33: note: expanded from macro 'RSTRUCT_PTR'
  
  #define RSTRUCT_PTR(st)         rb_struct_ptr(st)
  
                                  ^
  
  /usr/local/Cellar/ruby/2.4.0/include/ruby-2.4.0/ruby/intern.h:889:25: note: 'rb_struct_ptr' has been explicitly marked deprecated here
  
  DEPRECATED(const VALUE *rb_struct_ptr(VALUE s));
  
                          ^
  
  dump.c:1776:37: warning: assigning to 'VALUE *' (aka 'unsigned long *') from 'const VALUE *' (aka 'const unsigned long *') discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
  
          for (i = (int)RSTRUCT_LEN(obj), vp = RSTRUCT_PTR(obj); 0 &lt; i; i--, vp++) {
  
                                             ^ ~~~~~~~~~~~~~~~~
  
  4 warnings generated.
  
  compiling err.c
  
  compiling fast.c
  
  fast.c:816:17: warning: 'rb_data_object_alloc' is deprecated: by rb_data_object_wrap [-Wdeprecated-declarations]
  
      doc-&gt;self = rb_data_object_alloc(clas, doc, 0, free_doc_cb);
  
                  ^
  
  /usr/local/Cellar/ruby/2.4.0/include/ruby-2.4.0/ruby/ruby.h:1379:1: note: 'rb_data_object_alloc' has been explicitly marked deprecated here
  
  rb_data_object_alloc(VALUE klass, void *data, RUBY_DATA_FUNC dmark, RUBY_DATA_FUNC dfree)
  
  ^
  
  fast.c:1280:24: error: use of undeclared identifier 'rb_cFixnum'
  
          case T_FIXNUM:  type = rb_cFixnum;      break;
  
                                 ^
  
  1 warning and 1 error generated.
  
  make: *** [fast.o] Error 1
  
  
  
  make failed, exit code 2
  
  
  
  Gem files will remain installed in /usr/local/lib/ruby/gems/2.4.0/gems/oj-2.12.14 for inspection.
  
  Results logged to /usr/local/lib/ruby/gems/2.4.0/extensions/x86_64-darwin-16/2.4.0/oj-2.12.14/gem_make.out
  </code></pre>