我试图在我的Mac OSx上安装一个用于Rally和bugzilla的连接器。运行安装脚本时，它会尝试安装 gem 并查找我的机器上已经存在的libxml2。
当它尝试安装 nokogiri 时会发生这种情况。
以下为文字实录：
Building native extensions with: '--use-system-libraries'
This could take a while...
ERROR: Error installing nokogiri:
ERROR: Failed to build gem native extension.
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby -r ./siteconf20150121-48754-wgouyu.rb extconf.rb --use-system-libraries
Extracting libxml2-2.8.0.tar.gz into tmp/x86_64-apple-darwin13.4.0/ports/libxml2/2.8.0... OK
Running 'configure' for libxml2 2.8.0... OK
Running 'compile' for libxml2 2.8.0... OK
Running 'install' for libxml2 2.8.0... OK
Activating libxml2 2.8.0 (from /Library/Ruby/Gems/2.0.0/gems/nokogiri-1.6.1/ports/x86_64-apple-darwin13.4.0/libxml2/2.8.0)...
Extracting libxslt-1.1.26.tar.gz into tmp/x86_64-apple-darwin13.4.0/ports/libxslt/1.1.26... OK
Running 'configure' for libxslt 1.1.26... OK
Running 'compile' for libxslt 1.1.26... OK
Running 'install' for libxslt 1.1.26... OK
Activating libxslt 1.1.26 (from /Library/Ruby/Gems/2.0.0/gems/nokogiri-1.6.1/ports/x86_64-apple-darwin13.4.0/libxslt/1.1.26)...
checking for libxml/parser.h... yes
checking for libxslt/xslt.h... yes
checking for libexslt/exslt.h... yes
checking for iconv_open() in iconv.h... no
checking for iconv_open() in -liconv... yes
checking for xmlParseDoc() in -lxml2... no
-----
` libxml2 is missing. please visit http://nokogiri.org/tutorials /installing_nokogiri.html for help with installing dependencies.`
-----
*** 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=/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby
--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-iconv-dir
--without-iconv-dir
--with-iconv-include
--without-iconv-include=${iconv-dir}/include
--with-iconv-lib
--without-iconv-lib=${iconv-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-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-libxml-2.0-config
--without-libxml-2.0-config
--with-pkg-config
--without-pkg-config
--with-libiconv-config
--without-libiconv-config
--with-pkg-config
--without-pkg-config
--with-iconvlib
--without-iconvlib
--with-xml2lib
--without-xml2lib
extconf failed, exit code 1
Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/nokogiri-1.6.1 for inspection.
Results logged to /Library/Ruby/Gems/2.0.0/extensions/universal-darwin-13/2.0.0/nokogiri-1.6.1/gem_make.out
我尝试了很多选项，例如通过运行以下命令安装命令行工具。 xcode-select --install
将符号链接添加到 gcc 编译器
sudo ln -s /usr/bin/llvm-gcc /usr/bin/gcc-4.2
这两天我一直在挣扎。任何帮助都是高度赞赏的。
如果您使用的是brew，请在终端中使用以下命令：
brew unlink gcc-4.2 # you might not need this step
gem uninstall nokogiri
xcode-select --install
gem install nokogiri
如果这不起作用，请检查"在OSX 10.10优胜美地上安装Nokogiri"
解决了命令的问题
sudo ARCHFLAGS="-arch x86_64" gem install nokogiri -v '1.6.1'
感谢穆罕默德·阿卜杜勒指出的链接。
这对我有用：
sudo gem install nokogiri --no-rdoc --no-ri