rails初心者です。railsのエラーについての質問です。

railsでbcyptのgemを入れてbandle install したところ以下のエラー文がでました。ネットで似たようなエラーの対策を検索して
bundle update
Gemfile.lockの削除と再度bundle install
↓Gemfileでは以下のようにバージョンをしないでbundle installやってみました
gem 'bcrypt'

コマンドと表示された文を貼る修正をしました。すみません。

解決策を教えてください

$ bundle install
Fetching gem metadata from https://rubygems.org/.........
Fetching version metadata from https://rubygems.org/..
Fetching dependency metadata from https://rubygems.org/.
Resolving dependencies...
Using rake 11.2.2
Using concurrent-ruby 1.0.2
Using i18n 0.7.0
Using minitest 5.9.0
Using thread_safe 0.3.5
Using builder 3.2.2
Using erubis 2.7.0
Using mini_portile2 2.1.0
Using pkg-config 1.1.7
Using rack 2.0.1
Using nio4r 1.2.1
Using websocket-extensions 0.1.2
Using mime-types-data 3.2016.0521
Using arel 7.1.2
Using execjs 2.7.0
Using sass 3.4.22
Using bundler 1.13.0
Using byebug 9.0.5
Using coffee-script-source 1.10.0
Using method_source 0.8.2
Using thor 0.19.1
Using debug_inspector 0.0.2
Using diff-lcs 1.2.5
Using ffi 1.9.14
Using tilt 2.0.5
Using sexp_processor 4.7.0
Using multi_json 1.12.1
Using rb-fsevent 0.9.7
Using puma 3.6.0
Using rspec-support 3.5.0
Using spring 1.7.2
Using sqlite3 1.3.11
Using turbolinks-source 5.0.0
Using tzinfo 1.2.2
Using nokogiri 1.6.8
Using rack-test 0.6.3
Using sprockets 3.7.0
Using websocket-driver 0.6.4
Using mime-types 3.1
Bundler::GemspecError: Could not read gem at /Users/mypc/myapp/vendor/bundle/ruby/2.3.0/cache/bcrypt-3.1.11.gem. It may be corrupted.
An error occurred while installing bcrypt (3.1.11), and Bundler cannot continue.
Make sure that `gem install bcrypt -v '3.1.11'` succeeds before bundling.

$ bundle update
Fetching gem metadata from https://rubygems.org/.........
Fetching version metadata from https://rubygems.org/..
Fetching dependency metadata from https://rubygems.org/.
Resolving dependencies...
Using rake 11.2.2
Using concurrent-ruby 1.0.2
Using i18n 0.7.0
Using minitest 5.9.0
Using thread_safe 0.3.5
Using builder 3.2.2
Using erubis 2.7.0
Using mini_portile2 2.1.0
Using pkg-config 1.1.7
Using rack 2.0.1
Using nio4r 1.2.1
Using websocket-extensions 0.1.2
Using mime-types-data 3.2016.0521
Using arel 7.1.2
Using execjs 2.7.0
Using sass 3.4.22
Using bundler 1.13.0
Using byebug 9.0.5
Using coffee-script-source 1.10.0
Using method_source 0.8.2
Using thor 0.19.1
Using debug_inspector 0.0.2
Using diff-lcs 1.2.5
Using ffi 1.9.14
Using tilt 2.0.5
Using sexp_processor 4.7.0
Using multi_json 1.12.1
Using rb-fsevent 0.9.7
Using puma 3.6.0
Using rspec-support 3.5.0
Using spring 1.7.2
Using sqlite3 1.3.11
Using turbolinks-source 5.0.0
Using tzinfo 1.2.2
Using sprockets 3.7.0
Using nokogiri 1.6.8
Using rack-test 0.6.3
Using websocket-driver 0.6.4
Bundler::GemspecError: Could not read gem at /Users/mypc/myapp/vendor/bundle/ruby/2.3.0/cache/bcrypt-3.1.11.gem. It may be corrupted.
An error occurred while installing bcrypt (3.1.11), and Bundler cannot continue.
Make sure that `gem install bcrypt -v '3.1.11'` succeeds before bundling.

$ gem install bcrypt --version '3.1.11'
ERROR:  While executing gem ... (Errno::EACCES)
    Permission denied @ rb_sysopen - /Users/mypc/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bcrypt-3.1.11/.gitignore
mypc@mypc:~/myapp (hoge *+)
$ sudo gem install bcrypt --version '3.1.11'
Password:
Building native extensions.  This could take a while...
ERROR:  Error installing bcrypt:
       	ERROR: Failed to build gem native extension.

    current directory: /Users/mypc/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bcrypt-3.1.11/ext/mri
/Users/mypc/.rbenv/versions/2.3.1/bin/ruby -r ./siteconf20160917-47379-mjzwki.rb extconf.rb
creating Makefile

current directory: /Users/mypc/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bcrypt-3.1.11/ext/mri
make "DESTDIR=" clean

You have not agreed to the Xcode license agreements, please run 'xcodebuild -license' (for user-level acceptance) or 'sudo xcodebuild -license' (for system-wide acceptance) from within a Terminal window to review and agree to the Xcode license agreements.

current directory: /Users/mypc/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bcrypt-3.1.11/ext/mri
make "DESTDIR="

You have not agreed to the Xcode license agreements, please run 'xcodebuild -license' (for user-level acceptance) or 'sudo xcodebuild -license' (for system-wide acceptance) from within a Terminal window to review and agree to the Xcode license agreements.

make failed, exit code 69

Gem files will remain installed in /Users/mypc/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bcrypt-3.1.11 for inspection.
Results logged to /Users/mypc/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/extensions/x86_64-darwin-15/2.3.0-static/bcrypt-3.1.11/gem_make.out