twitter gemをinstallしようとするとAn error occurred while installing unf_ext (0.0.7.5), and Bundler cannot c

Question

twitterのgemをinstallしようとしているのですが下記のエラーが出てしまい、installできない状態です。

extconf failed, exit code 1

Gem files will remain installed in
/Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/unf_ext-0.0.7.5 for inspection.
Results logged to
/Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/extensions/x86_64-darwin-16/2.3.0-static/unf_ext-0.0.7.5/gem_make.out

An error occurred while installing unf_ext (0.0.7.5), and Bundler cannot continue.
Make sure that `gem install unf_ext -v '0.0.7.5'` succeeds before bundling.

In Gemfile:
  twitter was resolved to 6.2.0, which depends on
    http was resolved to 3.0.0, which depends on
      http-cookie was resolved to 1.0.3, which depends on
        domain_name was resolved to 0.5.20170404, which depends on
          unf was resolved to 0.1.4, which depends on
            unf_ext

gem install unf_ext -v '0.0.7.5'をうつと下記のエラーが

Building native extensions.  This could take a while...
/Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/rubygems/ext/builder.rb:76: warning: Insecure world writable dir /usr/local in PATH, mode 040777
ERROR:  Error installing unf_ext:
	ERROR: Failed to build gem native extension.

    current directory: /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/unf_ext-0.0.7.5/ext/unf_ext
/Users/muraokayouhei/.rbenv/versions/2.3.0/bin/ruby -r ./siteconf20180306-9182-1vy6trc.rb extconf.rb
checking for main() in -lstdc++... *** 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=/Users/muraokayouhei/.rbenv/versions/2.3.0/bin/$(RUBY_BASE_NAME)
	--with-static-libstdc++
	--without-static-libstdc++
	--with-stdc++lib
	--without-stdc++lib
/Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
	from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:541:in `try_link0'
	from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:556:in `try_link'
	from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:765:in `try_func'
	from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:997:in `block in have_library'
	from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:942:in `block in checking_for'
	from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:350:in `block (2 levels) in postpone'
	from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:320:in `open'
	from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:350:in `block in postpone'
	from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:320:in `open'
	from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:346:in `postpone'
	from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:941:in `checking_for'
	from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:992:in `have_library'
	from extconf.rb:6:in `<main>'

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

  /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/extensions/x86_64-darwin-16/2.3.0-static/unf_ext-0.0.7.5/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/unf_ext-0.0.7.5 for inspection.
Results logged to /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/extensions/x86_64-darwin-16/2.3.0-static/unf_ext-0.0.7.5/gem_make.out

Answer 1

https://qiita.com/casmb200/items/3d88d069fbf8431b155e

この記事の通り、xcodeのlicenceがagreeになっていないだけだった。

Answer 2

gem install "You have to install development tools first."
で google 原作してみると。いろいろ情報が得られると思います。

OS の情報があると、もっと絞り込んで検索できます。

... sudo apt-get install libxml2-dev libxslt-dev ...

とか

... xcode-select --install ...

とか, 同様のエラーの解消の方法例がいろいろ出てきます。

Answer 3

エラーメッセージに以下のように出ていますので、まずはこちらを試してみてはいかがでしょうか？

An error occurred while installing unf_ext (0.0.7.5), and Bundler cannot continue.
Make sure that `gem install unf_ext -v '0.0.7.5'` succeeds before bundling.

Comments

[you88]

試したんですが追記のエラーが出てしまい。。。

[bassbone]

「追記のエラー」とは何を指していますでしょうか？

[you88]

すみません、言葉足らずで質問の”gem install unf_ext -v '0.0.7.5'をうつと下記のエラーが”以下に記載した内容になります。

[bassbone]

エラーに「/Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/extensions/x86_64-darwin-16/2.3.0-static/unf_ext-0.0.7.5/mkmf.log」を確認してみてとあるので、一度確認してみるとよいかと思います。