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Question

gem install unf_ext -v '0.0.6' 
localhost:workflow_boyun ryan007$ gem install unf_ext -v '0.0.6' 
Building native extensions. This could take a while... 
ERROR: Error installing unf_ext: 
    ERROR: Failed to build gem native extension. 

     /Users/ryan007/.rvm/rubies/ruby-1.9.3-p392/bin/ruby 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 
    --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/ryan007/.rvm/rubies/ruby-1.9.3-p392/bin/ruby 
    --with-stdc++lib 
    --without-stdc++lib 
/Users/ryan007/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError) 
You have to install development tools first. 
    from /Users/ryan007/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:461:in `try_link0' 
    from /Users/ryan007/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:476:in `try_link' 
    from /Users/ryan007/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:619:in `try_func' 
    from /Users/ryan007/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:845:in `block in have_library' 
    from /Users/ryan007/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for' 
    from /Users/ryan007/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone' 
    from /Users/ryan007/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:254:in `open' 
    from /Users/ryan007/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone' 
    from /Users/ryan007/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:254:in `open' 
    from /Users/ryan007/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:280:in `postpone' 
    from /Users/ryan007/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for' 
    from /Users/ryan007/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:840:in `have_library' 
    from extconf.rb:2:in `<main>' 


Gem files will remain installed in /Users/ryan007/.rvm/gems/ruby-1.9.3-p392@rails3.2.8/gems/unf_ext-0.0.6 for inspection. 
Results logged to /Users/ryan007/.rvm/gems/ruby-1.9.3-p392@rails3.2.8/gems/unf_ext-0.0.6/ext/unf_ext/gem_make.out 

Answer 1

지난 주 일요일에 Mac OS를 10.9로 업데이트하지만 명령 줄 도구를 잊어 버렸습니다. xcode를 확인할 때 "명령 줄 도구"를 찾지 못했습니다. 결국 "실행 xcode-select --install"이라고 말했고, 그 사람과 잘 어울리면 작동합니다. "명령 줄 도구"를 설치하면 모든 것이 잘됩니다. . 내 대답은 u를 도울 수 있기를 바랍니다.