尝试运行命令gem install rails --no-ri --no-rdoc来安装rails。我目前正在优胜美地（Mac OS X v10.10.3）上运行ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-darwin14]。我试过从这篇文章重新安装Nokogiri：Installing Nokogiri on OSX 10.10 Yosemite和Nokogiri安装得很好。但是，每次我尝试安装Rails时，都会得到完全相同的错误。我已经安装了libxml2和libxslt而没有任何问题，并且就像每个教程都向我展示的那样链接它们。关于我接下来可能会尝试的事情，我的智慧结束了。有什么建议吗？
gem install rails --no-ri --no-rdoc的确切输出如下：
Building native extensions. This could take a while...
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
/Users/Neophile/.rvm/rubies/ruby-2.2.1/bin/ruby -r ./siteconf20150620-30888-546cip.rb extconf.rb
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 packaged libraries.
checking for gzdopen() in -lz... yes
checking for iconv... yes
************************************************************************
IMPORTANT NOTICE:
Building Nokogiri with a packaged version of libxml2-2.9.2
with the following patches applied:
- 0001-Revert-Missing-initialization-for-the-catalog-module.patch
- 0002-Fix-missing-entities-after-CVE-2014-3660-fix.patch
Team Nokogiri will keep on doing their best to provide security
updates in a timely manner, but if this is a concern for you and want
to use the system library instead; abort this installation process and
reinstall nokogiri as follows:
gem install nokogiri -- --use-system-libraries
[--with-xml2-config=/path/to/xml2-config]
[--with-xslt-config=/path/to/xslt-config]
If you are using Bundler, tell it to use the option:
bundle config build.nokogiri --use-system-libraries
bundle install
Note, however, that nokogiri is not fully compatible with arbitrary
versions of libxml2 provided by OS/package vendors.
************************************************************************
Extracting libxml2-2.9.2.tar.gz into tmp/x86_64-apple-darwin14.1.0/ports/libxml2/2.9.2... OK
Running patch with /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/patches/libxml2/0001-Revert-Missing-initialization-for-the-catalog-module.patch...
Running 'patch' for libxml2 2.9.2... OK
Running patch with /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/patches/libxml2/0002-Fix-missing-entities-after-CVE-2014-3660-fix.patch...
Running 'patch' for libxml2 2.9.2... OK
Running 'configure' for libxml2 2.9.2... OK
Running 'compile' for libxml2 2.9.2... OK
Running 'install' for libxml2 2.9.2... OK
Activating libxml2 2.9.2 (from /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/x86_64-apple-darwin14.1.0/libxml2/2.9.2)...
************************************************************************
IMPORTANT NOTICE:
Building Nokogiri with a packaged version of libxslt-1.1.28
with the following patches applied:
- 0001-Adding-doc-update-related-to-1.1.28.patch
- 0002-Fix-a-couple-of-places-where-f-printf-parameters-wer.patch
- 0003-Initialize-pseudo-random-number-generator-with-curre.patch
- 0004-EXSLT-function-str-replace-is-broken-as-is.patch
- 0006-Fix-str-padding-to-work-with-UTF-8-strings.patch
- 0007-Separate-function-for-predicate-matching-in-patterns.patch
- 0008-Fix-direct-pattern-matching.patch
- 0009-Fix-certain-patterns-with-predicates.patch
- 0010-Fix-handling-of-UTF-8-strings-in-EXSLT-crypto-module.patch
- 0013-Memory-leak-in-xsltCompileIdKeyPattern-error-path.patch
- 0014-Fix-for-bug-436589.patch
- 0015-Fix-mkdir-for-mingw.patch
Team Nokogiri will keep on doing their best to provide security
updates in a timely manner, but if this is a concern for you and want
to use the system library instead; abort this installation process and
reinstall nokogiri as follows:
gem install nokogiri -- --use-system-libraries
[--with-xml2-config=/path/to/xml2-config]
[--with-xslt-config=/path/to/xslt-config]
If you are using Bundler, tell it to use the option:
bundle config build.nokogiri --use-system-libraries
bundle install
************************************************************************
Extracting libxslt-1.1.28.tar.gz into tmp/x86_64-apple-darwin14.1.0/ports/libxslt/1.1.28... OK
Running patch with /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/patches/libxslt/0001-Adding-doc-update-related-to-1.1.28.patch...
Running 'patch' for libxslt 1.1.28... OK
Running patch with /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/patches/libxslt/0002-Fix-a-couple-of-places-where-f-printf-parameters-wer.patch...
Running 'patch' for libxslt 1.1.28... OK
Running patch with /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/patches/libxslt/0003-Initialize-pseudo-random-number-generator-with-curre.patch...
Running 'patch' for libxslt 1.1.28... OK
Running patch with /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/patches/libxslt/0004-EXSLT-function-str-replace-is-broken-as-is.patch...
Running 'patch' for libxslt 1.1.28... OK
Running patch with /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/patches/libxslt/0006-Fix-str-padding-to-work-with-UTF-8-strings.patch...
Running 'patch' for libxslt 1.1.28... OK
Running patch with /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/patches/libxslt/0007-Separate-function-for-predicate-matching-in-patterns.patch...
Running 'patch' for libxslt 1.1.28... OK
Running patch with /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/patches/libxslt/0008-Fix-direct-pattern-matching.patch...
Running 'patch' for libxslt 1.1.28... OK
Running patch with /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/patches/libxslt/0009-Fix-certain-patterns-with-predicates.patch...
Running 'patch' for libxslt 1.1.28... OK
Running patch with /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/patches/libxslt/0010-Fix-handling-of-UTF-8-strings-in-EXSLT-crypto-module.patch...
Running 'patch' for libxslt 1.1.28... OK
Running patch with /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/patches/libxslt/0013-Memory-leak-in-xsltCompileIdKeyPattern-error-path.patch...
Running 'patch' for libxslt 1.1.28... OK
Running patch with /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/patches/libxslt/0014-Fix-for-bug-436589.patch...
Running 'patch' for libxslt 1.1.28... OK
Running patch with /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/patches/libxslt/0015-Fix-mkdir-for-mingw.patch...
Running 'patch' for libxslt 1.1.28... OK
Running 'configure' for libxslt 1.1.28... OK
Running 'compile' for libxslt 1.1.28... OK
Running 'install' for libxslt 1.1.28... OK
Activating libxslt 1.1.28 (from /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/x86_64-apple-darwin14.1.0/libxslt/1.1.28)...
checking for main() in -llzma... yes
checking for xmlParseDoc() in libxml/parser.h... no
checking for xmlParseDoc() in -lxml2... no
checking for xmlParseDoc() in -llibxml2... no
-----
libxml2 is missing. Please locate mkmf.log to investigate how it is failing.
-----
*** 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=/Users/Neophile/.rvm/rubies/ruby-2.2.1/bin/$(RUBY_BASE_NAME)
--help
--clean
--use-system-libraries
--enable-static
--disable-static
--with-zlib-dir
--without-zlib-dir
--with-zlib-include
--without-zlib-include=${zlib-dir}/include
--with-zlib-lib
--without-zlib-lib=${zlib-dir}/lib
--enable-cross-build
--disable-cross-build
--with-xml2lib
--without-xml2lib
--with-libxml2lib
--without-libxml2lib
extconf failed, exit code 1
Gem files will remain installed in /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2 for inspection.
Results logged to /Users/Neophile/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0/extensions/x86_64-darwin-14/2.2.0-static/nokogiri-1.6.6.2/gem_make.out