所以我安装了 ruby（x32 为 2.0.0）和 DevKit-mingw64-32-4.7.2-20130224-1151-sfx.exe 并确保它可以安装 json rubygem。我已经在管理员帐户中下载了 ruby.exe，并且正在以管理员身份运行命令行。我一直在谷歌上搜索这个问题一个小时，但还没有解决它！任何帮助，将不胜感激。
ERROR: Error installing nokogiri:
ERROR: Failed to build gem native extension.
C:/Ruby200/bin/ruby.exe extconf.rb
The system cannot find the path specified.
checking for libxml/parser.h... no
-----
libxml2 is missing. please visit http://nokogiri.org/tutorials/installing_nokog
iri.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=C:/Ruby200/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
Gem files will remain installed in C:/Ruby200/lib/ruby/gems/2.0.0/gems/nokogiri-
1.5.9 for inspection.
Results logged to C:/Ruby200/lib/ruby/gems/2.0.0/gems/nokogiri-1.5.9/ext/nokogir
i/gem_make.out