title: Bundle Install / TheRubyRacer gem cannot be installed on MacOS Catalina 10.15.2
body: <p>I'm getting tired of error when trying to bundle install and install therubyracer.
  I've tried everything from around the net and nothing helps.
  Already installed libv8 and x-code setup. 
  <strong>Appreciate your help!</strong></p>
  
  <p>After command <code>sudo gem install therubyracer -v '0.12.3'</code>, I'm receivin error:</p>
  
  <pre><code>    ERROR: Failed to build gem native extension.
  
      current directory: /Library/Ruby/Gems/2.6.0/gems/therubyracer-0.12.3/ext/v8
  /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby -I /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0 -r ./siteconf20191219-41979-115mu26.rb extconf.rb
  checking for -lpthread... yes
  checking for -lobjc... yes
  checking for v8.h... no
  *** extconf.rb failed ***
  Could not create Makefile due to some reason, probably lack of necessary
  libraries and/or headers.  Check the mkmf.log file for more details.  You may
  need configuration options.
  
  Provided configuration options:
      --with-opt-dir
      --without-opt-dir
      --with-opt-include
      --without-opt-include=${opt-dir}/include
      --with-opt-lib
      --without-opt-lib=${opt-dir}/lib
      --with-make-prog
      --without-make-prog
      --srcdir=.
      --curdir
      --ruby=/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/$(RUBY_BASE_NAME)
      --with-pthreadlib
      --without-pthreadlib
      --with-objclib
      --without-objclib
      --enable-debug
      --disable-debug
      --with-v8-dir
      --without-v8-dir
      --with-v8-include
      --without-v8-include=${v8-dir}/include
      --with-v8-lib
      --without-v8-lib=${v8-dir}/lib
  /Library/Ruby/Gems/2.6.0/gems/libv8-3.16.14.19/ext/libv8/location.rb:50:in `configure': By using --with-system-v8, you have chosen to use the version  (Libv8::Location::System::NotFoundError)
  of V8 found on your system and *not* the one that is bundled with
  the libv8 rubygem.
  
  However, your system version of v8 could not be located.
  
  Please make sure your system version of v8 that is compatible
  with 3.16.14.19 installed. You may need to use the
  --with-v8-dir option if it is installed in a non-standard location
      from /Library/Ruby/Gems/2.6.0/gems/libv8-3.16.14.19/lib/libv8.rb:7:in `configure_makefile'
      from extconf.rb:32:in `&lt;main&gt;'
  
  To see why this extension failed to compile, please check the mkmf.log which can be found here:
  
    /Library/Ruby/Gems/2.6.0/extensions/universal-darwin-19/2.6.0/therubyracer-0.12.3/mkmf.log
  
  extconf failed, exit code 1 ```
  </code></pre>