sablot build errors

When running configure in PHP 4.03pl1 with --with-sablot on Solaris 7, I get the following in debug.log. Anyone know why this is? Thanks. -Ken /usr/local/bin/gcc -o conftest -g -O2 -D_POSIX_PTHREAD_SEMANTICS -R/usr/ucblib -L/usr/ucblib -R/usr/local/mysql/lib -L/usr/local/mysql/lib -R/usr/local/lib -L/usr/local/lib conftest.c -lsablot -lmysqlclient -lresolv -lresolv -lm -ldl -lcrypt -lnsl -lsocket -lsocket 1>&5 Undefined first referenced symbol in file XML_SetCharacterDataHandler /usr/local/lib/libsablot.so XML_GetBuffer /usr/local/lib/libsablot.so XML_GetErrorCode /usr/local/lib/libsablot.so XML_SetBase /usr/local/lib/libsablot.so XML_ErrorString /usr/local/lib/libsablot.so XML_ExternalEntityParserCreate /usr/local/lib/libsablot.so XML_SetUnknownEncodingHandler /usr/local/lib/libsablot.so XML_ParserFree /usr/local/lib/libsablot.so XML_GetCurrentLineNumber /usr/local/lib/libsablot.so XML_SetCommentHandler /usr/local/lib/libsablot.so XML_SetExternalEntityRefHandler /usr/local/lib/libsablot.so XML_ParserCreateNS /usr/local/lib/libsablot.so XML_SetUserData /usr/local/lib/libsablot.so XML_SetNamespaceDeclHandler /usr/local/lib/libsablot.so XML_ParseBuffer /usr/local/lib/libsablot.so XML_SetProcessingInstructionHandler /usr/local/lib/libsablot.so XML_SetElementHandler /usr/local/lib/libsablot.so ld: fatal: Symbol referencing errors. No output written to conftest collect2: ld returned 1 exit status