I'm starting rails, problem with bundle

C:\Users\aaa\Kost\alex>bundle install
Fetching gem metadata from http://rubygems.org/
Resolving dependencies…
Using rake 13.0.3
Using concurrent-ruby 1.1.8
Using i18n 1.8.8
Using minitest 5.14.3
Using thread_safe 0.3.6
Using tzinfo 1.2.9
Using activesupport 5.1.7
Using builder 3.2.4
Using erubi 1.10.0
Fetching racc 1.5.2
Installing racc 1.5.2 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

current directory:
C:/Ruby27-x64/bin/ruby.exe -I C:/Ruby27-x64/lib/ruby/site_ruby/2.7.0 -r
./siteconf20210211-10188-bem31c.rb extconf.rb
checking for rb_ary_subseq()… *** 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:
C:/Ruby27-x64/lib/ruby/2.7.0/mkmf.rb:471:in try_do': The compiler failed to generate an executable file. (RuntimeError) You have to install development tools first. from C:/Ruby27-x64/lib/ruby/2.7.0/mkmf.rb:564:in try_link0’
from C:/Ruby27-x64/lib/ruby/2.7.0/mkmf.rb:582:in try_link' from C:/Ruby27-x64/lib/ruby/2.7.0/mkmf.rb:794:in try_func’
from C:/Ruby27-x64/lib/ruby/2.7.0/mkmf.rb:1083:in block in have_func' from C:/Ruby27-x64/lib/ruby/2.7.0/mkmf.rb:971:in block in checking_for’
from C:/Ruby27-x64/lib/ruby/2.7.0/mkmf.rb:361:in block (2 levels) in postpone' from C:/Ruby27-x64/lib/ruby/2.7.0/mkmf.rb:331:in open’
from C:/Ruby27-x64/lib/ruby/2.7.0/mkmf.rb:361:in block in postpone' from C:/Ruby27-x64/lib/ruby/2.7.0/mkmf.rb:331:in open’
from C:/Ruby27-x64/lib/ruby/2.7.0/mkmf.rb:357:in postpone' from C:/Ruby27-x64/lib/ruby/2.7.0/mkmf.rb:970:in checking_for’
from C:/Ruby27-x64/lib/ruby/2.7.0/mkmf.rb:1082:in have_func' from extconf.rb:6:in

To see why this extension failed to compile, please check the mkmf.log which can
be found here:


extconf failed, exit code 1

Gem files will remain installed in
C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/racc-1.5.2 for inspection.
Results logged to

An error occurred while installing racc (1.5.2), and Bundler cannot continue.
Make sure that gem install racc -v '1.5.2' --source 'http://rubygems.org/'
succeeds before bundling.

In Gemfile:
rails was resolved to 5.1.7, which depends on
actioncable was resolved to 5.1.7, which depends on
actionpack was resolved to 5.1.7, which depends on
actionview was resolved to 5.1.7, which depends on
rails-dom-testing was resolved to 2.0.3, which depends on
nokogiri was resolved to 1.11.1, which depends on

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