[root@localhost snow]# gem install ruby-xslt
Building native extensions.  This could take a while...
ERROR:  Error installing ruby-xslt:
	ERROR: Failed to build gem native extension.

    /usr/bin/ruby extconf.rb
/usr/share/ruby/mkmf.rb:1678: warning: instance variable @libdir_basename not initialized
/usr/share/ruby/mkmf.rb:1678: warning: instance variable @libdir_basename not initialized
checking for xmlParseDoc() in -lxml2... no
checking for xsltParseStylesheetFile() in -lxslt... no
checking for exsltRegisterAll() in -lexslt... no
*** 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}/lib64
	--with-make-prog
	--without-make-prog
	--srcdir=.
	--curdir
	--ruby=/usr/bin/ruby
	--enable-error-handler
	--disable-error-handler
	--with-xml2-dir
	--without-xml2-dir
	--with-xml2-include
	--without-xml2-include=${xml2-dir}/include
	--with-xml2-lib
	--without-xml2-lib=${xml2-dir}/
	--with-xslt-dir
	--without-xslt-dir
	--with-xslt-include
	--without-xslt-include=${xslt-dir}/include
	--with-xslt-lib
	--without-xslt-lib=${xslt-dir}/
	--with-xml2lib
	--without-xml2lib
	--with-xsltlib
	--without-xsltlib
	--enable-exslt
	--disable-exslt
	--with-exsltlib
	--without-exsltlib
extconf.rb:57:in ``': No such file or directory - xml2-config (Errno::ENOENT)
	from extconf.rb:57:in `<main>'


Gem files will remain installed in /usr/local/share/gems/gems/ruby-xslt-0.9.9 for inspection.
Results logged to /usr/local/share/gems/gems/ruby-xslt-0.9.9/ext/xslt_lib/gem_make.out