text search/retrieval C toolkits?

[Brian Dear]

Anyone know of any text search/retrieval C toolkits besides Fulcrum
Technologies' Ful/Text (which I believe sells for $45,000)?  I'm trying
to find something a little less expensive.  I need a C toolkit that
supports the indexing and searching of text files.  The toolkit should
be able to search for phrases or words, and boolean operators should
be allowed in the user's input.   Any suggestions? 
 
-- brian dear
   coconut computing, inc.
   brian at coconut.com