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Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
/usr/local/Cellar/ruby/2.1.4/bin/ruby -r ./siteconf20150116-80917-1s1c05a.rb extconf.rb --use-system-libraries
checking if the C compiler accepts ... yes
checking if the C compiler accepts -Wno-error=unused-command-line-argument-hard-error-in-future... no
Building nokogiri using system libraries.
libxml2 version 2.6.21 or later is required!
*** 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=/usr/local/Cellar/ruby/2.1.4/bin/ruby
--help
--clean
--use-system-libraries
--with-zlib-dir
--without-zlib-dir
--with-zlib-include
--without-zlib-include=${zlib-dir}/include
--with-zlib-lib
--without-zlib-lib=${zlib-dir}/lib
--with-xml2-dir
--without-xml2-dir
--with-xml2-include
--without-xml2-include=${xml2-dir}/include
--with-xml2-lib
--without-xml2-lib=${xml2-dir}/lib
--with-libxml-2.0-config
--without-libxml-2.0-config
--with-pkg-config
--without-pkg-config
--with-xslt-dir
--without-xslt-dir
--with-xslt-include
--without-xslt-include=${xslt-dir}/include
--with-xslt-lib
--without-xslt-lib=${xslt-dir}/lib
--with-libxslt-config
--without-libxslt-config
--with-pkg-config
--without-pkg-config
--with-exslt-dir
--without-exslt-dir
--with-exslt-include
--without-exslt-include=${exslt-dir}/include
--with-exslt-lib
--without-exslt-lib=${exslt-dir}/lib
--with-libexslt-config
--without-libexslt-config
--with-pkg-config
--without-pkg-config
extconf failed, exit code 1
Gem files will remain installed in /Users/senwang/Desktop/wsBlogRails/swBlog/vendor/bundle/ruby/2.1.0/gems/nokogiri-1.6.5 for inspection.
Results logged to /Users/senwang/Desktop/wsBlogRails/swBlog/vendor/bundle/ruby/2.1.0/extensions/x86_64-darwin-14/2.1.0/nokogiri-1.6.5/gem_make.out
An error occurred while installing nokogiri (1.6.5), and Bundler cannot
continue.
Make sure that `gem install nokogiri -v ‘1.6.5‘` succeeds before bundling.
修复方法：
brew install libxml2 bundle config build.nokogiri "--use-system-libraries --with-xml2-include=/usr/local/opt/libxml2/include/libxml2" bundle install
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原文地址：http://www.cnblogs.com/fengchiwanli/p/4229888.html
