我是rails的新手，我不明白为什么Nokogiri在我尝试捆绑安装时不想安装：
barnab21:sample_app barnab21$ sudo bundle install
Don't run Bundler as root. Bundler can ask for sudo if it is needed, and installing your bundle as
root will break this application for all non-root users on this machine.
Fetching gem metadata from http://rubygems.org/.........
Using rake 0.9.6
Using abstract 1.0.0
Using activesupport 3.0.7
Using builder 2.1.2
Using i18n 0.5.4
Using activemodel 3.0.7
Using erubis 2.6.6
Using rack 1.2.8
Using rack-mount 0.6.14
Using rack-test 0.5.7
Using tzinfo 0.3.39
Using actionpack 3.0.7
Using mime-types 1.25.1
Using polyglot 0.3.5
Using treetop 1.4.15
Using mail 2.2.20
Using actionmailer 3.0.7
Using arel 2.0.10
Using activerecord 3.0.7
Using activeresource 3.0.7
Using diff-lcs 1.1.3
Using mini_portile 0.6.0
Building nokogiri using system libraries.
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb --use-system-libraries
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
--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
--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 /Library/Ruby/Gems/2.0.0/gems/nokogiri-1.6.2.1 for inspection.
Results logged to /Library/Ruby/Gems/2.0.0/extensions/universal-darwin-13/2.0.0/nokogiri-1.6.2.1/gem_make.out
An error occurred while installing nokogiri (1.6.2.1), and Bundler cannot continue.
Make sure that `gem install nokogiri -v '1.6.2.1'` succeeds before bundling.
我试试这个：
$ xcode-select --install
然后gem安装nogoriki，但那不起作用。
我试试这个，来自其他stackoverflow线程：
如果以前安装过，请卸载gem：
$ gem uninstall nokogiri
如果需要，使用Homebrew安装libxml2，libxslt和libiconv：
$ brew install libxml2 libxslt libiconv
安装gem，指定要链接的库的路径：
$ NOKOGIRI_USE_SYSTEM_LIBRARIES=1 gem install nokogiri -- --use-system-libraries --with-iconv-dir="$(brew --prefix libiconv)" --with-xml2-config="$(brew --prefix libxml2)/bin/xml2-config" --with-xslt-config="$(brew --prefix libxslt)/bin/xslt-config"
并且：
This could take a while...
Building nokogiri using system libraries.
ERROR: Error installing nokogiri:
ERROR: Failed to build gem native extension.
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb --use-system-libraries --with-iconv-dir=/usr/local/opt/libiconv --with-xml2-config=/usr/local/opt/libxml2/bin/xml2-config --with-xslt-config=/usr/local/opt/libxslt/bin/xslt-config
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.
我不知道该尝试什么... thx 我的mac：Macbook pro retina 15，mavericks
答案 0 :(得分：4)
$ brew install libxml2 libxslt libiconv之后我使用了
gem install nokogiri -- --with-xml2-include=/usr/local/Cellar/libxml2/2.7.8/include/libxml2 --with-xml2-lib=/usr/local/Cellar/libxml2/2.7.8/lib --with-xslt-dir=/usr/local/Cellar/libxslt/1.1.26 --with-iconv-include=/usr/local/Cellar/libiconv/1.14/include --with-iconv-lib=/usr/local/Cellar/libiconv/1.14/lib
它对我有用。您可以尝试，但可以将库的版本更改为您的。
答案 1 :(得分：0)
所以我在约塞米蒂，认为这可能会有所帮助。 上面的解决方案对我来说不起作用，但后来我意识到有几个目录已经以某种方式进入了自己
- 与-XML2-包括=的/ usr /本地/地窖/ libxml2的/ 2.9.2 /包含/的libxml2 / 的libxml
- 与-的iconv-LIB =的/ usr /本地/地窖/ libiconv的/ 1.14 / LIB / 的lib
所以可能值得检查所有目录，如果有人仍然有问题（哈，我不认为我把这样的文件，但它完全有可能）
我使用的完整命令：
gem install nokogiri - --with-xml2-include = / usr / local / Cellar / libxml2 / 2.9.2 / include / libxml2 / libxml --with-xml2-lib = / usr / local / Cellar / libxml2 /2.9.2/lib --with-xslt-dir = / usr / local / Cellar / libxslt / 1.1.28 --with-iconv-include = / usr / local / Cellar / libiconv / 1.14 / include --with-的iconv-LIB =的/ usr /本地/地窖/ libiconv的/ 1.14 / LIB / lib中
答案 2 :(得分：0)
在Redhat linux 6中遇到了同样的问题
你需要安装软件包libxml2＆amp; libxml2-devel和libxslt＆amp;的libxslt-devel的。
{你需要安装libgcrypt＆amp; libgcrpt-devel，因为它需要安装在上面的包}
确保安装最新版本。 如果包已经存在，那么您需要升级这些包。 只需使用