unknown search engine backend NCBI::PubMed (Can't locate WWW/Search/NCBI/PubMed.pm in @INC (@INC contains: /usr/lib/perl5/5.8.7/i586-linux-thread-multi /usr/lib/perl5/5.8.7 /usr/lib/perl5/site_perl/5.8.7/i586-linux-thread-multi /usr/lib/perl5/site_perl/5.8.7 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.8.7/i586-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.7 /usr/lib/perl5/vendor_perl .) at (eval 12) line 2.
BEGIN failed--compilation aborted at (eval 12) line 2.