I installed the LWP module, maybe I did something wrong. running slackware 3.4 apache webserver.

I get this error

Can't locate HTML/HeadParser.pm in @INC (@INC contains: /usr/lib/perl5/i486-linu
x/5.00403 /usr/lib/perl5 /usr/lib/perl5/site_perl/i486-linux /usr/lib/perl5/site
_perl .) at /usr/lib/perl5/site_perl/LWP/Protocol.pm line 46.
BEGIN failed--compilation aborted at /usr/lib/perl5/site_perl/LWP/UserAgent.pm l
ine 106.
BEGIN failed--compilation aborted at ./nph-verify.cgi line 50.

please help