As of the middle of November 2008, the NCBI/PubMed servers have been a
bit unpredictable in returning results to queries issued by
WWW::Search::PubMedLite. The specific failures appear to be limited to
those queries that request PubMed Central IDs. For example:
http://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=16402093&db=pmc
The error returned by NCBI is "error 803/temporarily unavailable" (see
attached screenshot), which prevents WWW::Search::PubMedLite from
filling the pmc_id field in results.
This impacts "make test"; specifically, if this error is encountered,
the "pmc_id" test will be skipped and a brief explanation will be given.
It should be safe to continue with the installation provided that the
other tests are working. Again, it appears that this problem
is confined to the generation of the pmc_id field.
-- David Iberri