gem安装报错

在ubuntu11.04上安装mysql2的gem是报错

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*** 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.

。。。。。

之类的

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sudo apt-get install libmysql-ruby libmysqlclient-dev

?这样竟然就解决了

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在安装nokogiri时，报

Building native extensions.  This could take a while...ERROR:  Error installing nokogiri:ERROR: Failed to build gem native extension.        /usr/local/ruby1.8/bin/ruby extconf.rbchecking for libxml/parser.h... 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 ofnecessary libraries and/or headers.  Check the mkmf.log file for moredetails.  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=/usr/local/ruby1.8/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}/libGem files will remain installed in /usr/local/ruby1.8/lib/ruby/gems/1.8/gems/nokogiri-1.5.0 for inspection.Results logged to /usr/local/ruby1.8/lib/ruby/gems/1.8/gems/nokogiri-1.5.0/ext/nokogiri/gem_make.out

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但在装libxml2时，提示找不到这个包，后来搜索了一下，发现这样就解决了

sudo apt-get install libxslt1-dev libxml2-dev