unable to install nokogiri in ubuntu 12.04
===

I am trying to setup rails env on my new ubuntu machine. But I am facing trouble while install nokogiri gem.. I have installed libxslt and libxml2 libs thourgh rvm pkg command as well as using apt-get. I thought it is showing me libxslt is missing error. 


    Building native extensions.  This could take a while...
    ERROR:  Error installing nokogiri:
    	ERROR: Failed to build gem native extension.
    
            /home/hacker5/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb --with-xslt-include=/usr/include/libxslt
    checking for libxml/parser.h... yes
    checking for libxslt/xslt.h... yes
    checking for libexslt/exslt.h... yes
    checking for iconv_open() in iconv.h... no
    checking for iconv_open() in -liconv... yes
    checking for xmlParseDoc() in -lxml2... yes
    checking for xsltParseStylesheetDoc() in -lxslt... no
    -----
    libxslt is missing.  please visit http://nokogiri.org/tutorials/installing_nokogiri.html for help with installing dependencies.
    -----


**EDIT**

I am using rvm setup and ruby 1.9.3