It's part of the libwww-perl library, which is easiest installed via Bundle::LWP. One can do this quickly and trivially using the CPAN module which comes with Perl. As root, simply type perl -MCPAN -e 'install "Bundle::LWP"', sit back, and wait.

 
perl -e 'print "I love $^X$\"$]!$/"#$&V"+@( NO CARRIER'