Hello,
I'm trying to install the blackbook gem on my m/c with centos , but i
get the following error:
Building native extensions.  This could take a while...
ERROR:  Error installing blackbook:
        ERROR: Failed to build gem native extension.

/opt/ruby-enterprise-1.8.6-20090201/bin/ruby extconf.rb install
blackbook
checking for #include <libxml/parser.h>
... yes
checking for #include <libxslt/xslt.h>
... no
libxslt is missing.  try 'port install libxslt' or 'yum install libxslt'
*** 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=/opt/ruby-enterprise-1.8.6-20090201/bin/ruby
        --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


Gem files will remain installed in
/opt/ruby-enterprise-1.8.6-20090201/lib/ruby/gems/1.8/gems/nokogiri-1.2.1
for inspection.
Results logged to
/opt/ruby-enterprise-1.8.6-20090201/lib/ruby/gems/1.8/gems/nokogiri-1.2.1/ext/nokogiri/gem_make.out

Please can someone help me solve this....
Thank you....
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