http://www.sphinxsearch.com/bugs/view.php?id=468
http://code.google.com/p/sphinxsearch/source/detail?r=2225

--- sphinx-0.9.9/api/libsphinxclient/sphinxclient.c~	2009-11-14 01:23:06.000000000 +0200
+++ sphinx-0.9.9/api/libsphinxclient/sphinxclient.c	2010-03-31 00:51:23.815645056 +0300
@@ -277,7 +277,7 @@
 }
 
 
-void sock_close ( int sock );
+static void sock_close ( int sock );
 
 void sphinx_destroy ( sphinx_client * client )
 {
@@ -1253,7 +1253,7 @@
 }
 
 
-void sock_close ( int sock )
+static void sock_close ( int sock )
 {
 	if ( sock<0 )
 		return;