我觉得我已经阅读了每个教程和所有StackExchange帖子，并且在尝试安装Rails时仍然遇到同样的错误。这是我得到的常见错误：
$ gem install rails --no-ri --no-rdoc
Building native extensions. This could take a while...
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
/Users/jdesilvio/.rvm/rubies/ruby-2.2.0/bin/ruby -r ./siteconf20150409-59802-iosiis.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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/gems/ruby-2.2.0@global/gems/nokogiri-1.6.6.2 for inspection.
Results logged to /Users/jdesilvio/.rvm/gems/ruby-2.2.0@global/extensions/x86_64-darwin-14/2.2.0-static/nokogiri-1.6.6.2/gem_make.out
我的操作系统是OS X Yosemite 10.10.2
这是我到目前为止安装的内容，我使用RMV来安装Ruby：
$ ruby -v
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
$ xcode-select -p
/Applications/Xcode.app/Contents/Developer
$ gcc --version
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr -- with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin14.1.0
Thread model: posix
$ gem -v
2.4.6
我已经使用以下方法安装Rails并继续收到上述错误：
$ gem install rails --no-ri --no-rdoc
$ gem install rails -v 4.2.0
$ gem install nokogiri -- --use-system-libraries --with-xml2-include=/opt/local/include/libxml2 --with-xml2-lib=/opt/local/lib --with-xslt-dir=/opt/local
$ sudo gem install rails --no-ri --no-rdoc
我不知道还能做什么，请帮助。
@rainkinz：
$ cat /Users/jdesilvio/.rvm/gems/ruby-2.2.0@global/extensions/x86_64-darwin-14/2.2.0-static/nokogiri-1.6.6.2/gem_make.out
/Users/jdesilvio/.rvm/rubies/ruby-2.2.0/bin/ruby -r ./siteconf20150409-82655-12gg3g1.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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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/jdesilvio/.rvm/rubies/ruby-2.2.0/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
** brew doctor的输出：
$ brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry and just ignore them. Thanks!
Warning: Some directories in /usr/local/share/man aren't writable.
This can happen if you "sudo make install" software that isn't managed
by Homebrew. If a brew tries to add locale information to one of these
directories, then the install will fail during the link step.
You should probably `chown` them:
/usr/local/share/man/mann
Warning: A newer Command Line Tools release is available.
Update them from Software Update in the App Store.
Warning: "config" scripts exist outside your system or Homebrew directories.
`./configure` scripts often look for *-config scripts to determine if
software packages are installed, and what additional flags to use when
compiling and linking.
Having additional scripts in your path can confuse software installed via
Homebrew if the config script overrides a system or Homebrew provided
script of the same name. We found the following "config" scripts:
/opt/local/bin/libpng-config
/opt/local/bin/libpng16-config
/opt/local/bin/ncurses5-config
/opt/local/bin/ncursesw5-config
/opt/local/bin/pkg-config
/opt/local/bin/python2.7-config
/Users/jdesilvio/anaconda/bin/curl-config
/Users/jdesilvio/anaconda/bin/freetype-config
/Users/jdesilvio/anaconda/bin/libdynd-config
/Users/jdesilvio/anaconda/bin/libpng-config
/Users/jdesilvio/anaconda/bin/libpng15-config
/Users/jdesilvio/anaconda/bin/llvm-config
/Users/jdesilvio/anaconda/bin/python-config
/Users/jdesilvio/anaconda/bin/python2-config
/Users/jdesilvio/anaconda/bin/python2.7-config
/Users/jdesilvio/anaconda/bin/xml2-config
/Users/jdesilvio/anaconda/bin/xslt-config
/Library/Frameworks/Python.framework/Versions/3.4/bin/python3-config
/Library/Frameworks/Python.framework/Versions/3.4/bin/python3.4-config
/Library/Frameworks/Python.framework/Versions/3.4/bin/python3.4m-config
Warning: Python is installed at /Library/Frameworks/Python.framework
Homebrew only supports building against the System-provided Python or a
brewed Python. In particular, Pythons installed to /Library can interfere
with other software installs.
Warning: You have MacPorts or Fink installed:
/opt/local/bin/port
This can cause trouble. You don't have to uninstall them, but you may want to
temporarily move them out of the way, e.g.
sudo mv /opt/local ~/macports
Warning: Unbrewed dylibs were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.
Unexpected dylibs:
/usr/local/lib/libMonoPosixHelper.dylib
/usr/local/lib/libSFFileMonitor.32.dylib
/usr/local/lib/libSFIPC.32.dylib
/usr/local/lib/libSFIPC.I.dylib
/usr/local/lib/libSFsqlite3.7.4.dylib
/usr/local/lib/libSFSyncEngine.I.dylib
/usr/local/lib/libtcl8.6.dylib
/usr/local/lib/libtk8.6.dylib
Warning: Unbrewed header files were found in /usr/local/include.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.
Unexpected header files:
/usr/local/include/fakemysql.h
/usr/local/include/fakepq.h
/usr/local/include/fakesql.h
/usr/local/include/itcl.h
/usr/local/include/itcl2TclOO.h
/usr/local/include/itclDecls.h
/usr/local/include/itclInt.h
/usr/local/include/itclIntDecls.h
/usr/local/include/itclMigrate2TclCore.h
/usr/local/include/itclTclIntStubsFcn.h
/usr/local/include/mysqlStubs.h
/usr/local/include/odbcStubs.h
/usr/local/include/pqStubs.h
/usr/local/include/tcl.h
/usr/local/include/tclDecls.h
/usr/local/include/tclOO.h
/usr/local/include/tclOODecls.h
/usr/local/include/tclPlatDecls.h
/usr/local/include/tclThread.h
/usr/local/include/tclTomMath.h
/usr/local/include/tclTomMathDecls.h
/usr/local/include/tdbc.h
/usr/local/include/tdbcDecls.h
/usr/local/include/tdbcInt.h
/usr/local/include/tk.h
/usr/local/include/tkDecls.h
/usr/local/include/tkPlatDecls.h
Warning: Unbrewed .pc files were found in /usr/local/lib/pkgconfig.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.
Unexpected .pc files:
/usr/local/lib/pkgconfig/tcl.pc
/usr/local/lib/pkgconfig/tk.pc
Warning: Unbrewed static libraries were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.
Unexpected static libraries:
/usr/local/lib/libtclstub8.6.a
/usr/local/lib/libtkstub8.6.a
Warning: You have a non-Homebrew 'pkg-config' in your PATH:
/opt/local/bin/pkg-config
`./configure` may have problems finding brew-installed packages using
this other pkg-config.
Warning: Your Xcode (6.2) is outdated
Please update to Xcode 6.3.
Xcode can be updated from the App Store.
答案 0 :(得分：3)
根据您的brew医生输出：
sudo mv /opt/local ~/macports
mv /Users/jdesilvio/anaconda /Users/jdesilvio/anaconda.back
gem install nokogiri
然后可选地放回macports（你可能不应该同时拥有macports和homebrew）并且可选地放回anaconda（无论是什么）。我的猜测是，anaconda目录中的libxml2安装正在搞乱nokogiri安装的libxml2标头的路径。
答案 1 :(得分：0)
最好的办法是使用Ruby Version Manager来完成它。混淆OSX附带的ruby版本是一个坏主意，因为Apple依赖某个版本来完成它的更新日期。
安装RVM，Ruby和Rails
禁用多余文档
echo "gem: --no-document" >> ~/.gemrc
使用Ruby和Rails安装RVM
\curl -L https://get.rvm.io | bash -s stable --auto-dotfiles --autolibs=enabled --rails
在当前终端会话中加载RVM
source ~/.rvm/scripts/rvm
如果它不存在，请将其放在〜/ .profile文件中以便在每次登录时加载
[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"
检查RVM是否作为函数加载
type rvm | head -1
检查版本
rvm -v
ruby -v
rails -v