質問編集履歴
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gem install unf_ext -v '0.0.7.5'を打った後を追記
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domain_name was resolved to 0.5.20170404, which depends on
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unf was resolved to 0.1.4, which depends on
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unf_ext
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```
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gem install unf_ext -v '0.0.7.5'をうつと下記のエラーが
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```
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Building native extensions. This could take a while...
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/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
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ERROR: Error installing unf_ext:
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ERROR: Failed to build gem native extension.
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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
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/Users/muraokayouhei/.rbenv/versions/2.3.0/bin/ruby -r ./siteconf20180306-9182-1vy6trc.rb extconf.rb
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checking for main() in -lstdc++... *** extconf.rb failed ***
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Could not create Makefile due to some reason, probably lack of necessary
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libraries and/or headers. Check the mkmf.log file for more details. You may
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need configuration options.
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Provided configuration options:
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--with-opt-dir
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--without-opt-dir
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--with-opt-include
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--without-opt-include=${opt-dir}/include
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--with-opt-lib
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--without-opt-lib=${opt-dir}/lib
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--with-make-prog
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--without-make-prog
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--srcdir=.
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--curdir
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--ruby=/Users/muraokayouhei/.rbenv/versions/2.3.0/bin/$(RUBY_BASE_NAME)
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--with-static-libstdc++
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--without-static-libstdc++
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--with-stdc++lib
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--without-stdc++lib
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/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)
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You have to install development tools first.
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from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:541:in `try_link0'
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from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:556:in `try_link'
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from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:765:in `try_func'
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from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:997:in `block in have_library'
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from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:942:in `block in checking_for'
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from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:350:in `block (2 levels) in postpone'
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from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:320:in `open'
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from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:350:in `block in postpone'
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from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:320:in `open'
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from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:346:in `postpone'
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from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:941:in `checking_for'
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from /Users/muraokayouhei/.rbenv/versions/2.3.0/lib/ruby/2.3.0/mkmf.rb:992:in `have_library'
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from extconf.rb:6:in `<main>'
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To see why this extension failed to compile, please check the mkmf.log which can be found here:
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/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
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extconf failed, exit code 1
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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.
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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
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```
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