HELP---php4-yaz

Sorry, my English is terribIe, I work whit debian Linux,

# yaz-client z3950.loc.gov:7090/voyager
Connecting...OK.
Sent initrequest.
Connection accepted by v3 target.
ID     : 34
Name   : Voyager LMS - Z39.50 Server (YAZ Proxy)
Version: 2003.1.1/1.2.1.1
Options: search present
Elapsed: 0.240089
Z> find attr 1=4 USA
Sent searchRequest.
Received SearchResponse.
Search was a success.
Number of hits: 10000
records returned: 0
Elapsed: 2.325214

I installed php4-yaz and  this is my problem, I m using 
Example 3. the 
Parallel searching using Yaz of
http://www.p
hp.net/manual/en/ref.yaz.php

and the browser show me

You searched for USA
Fatal error: Call to undefined function: yaz_connect() in 
/var/www/meta/parallel.php on line 25



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