MySQL + MySQLi with PHP 5.1.3 ./configure errors

Hi, I've been searching all day through all the reasources i can find for a pointer in the right direction. I've just started a clean install of my LAMP system, and got to PHP. On ./configure it goes through all the normal processes untill it reaches the -lmysqladmin line, where it kicks out with the error "configure: error: wrong mysql library version or lib not found. Check config.log for more information.". This all worked fine last time round, only a few weeks before using PHP 5.1.2. (I had other issues that needed me to start over). I was wondering if anyone could show me the obious misstake i'm making. All the relivant code is as is below: ----configure script---- ../configure \

        --with-apxs2=/usr/local/www/bin/apxs \
        --with-mysqli=/usr/bin/mysql_config \
        --enable-ftp \
        --enable-trans-sid \
        --enable-soap

----congigure error---- checking for MySQLi support... yes checking whether to enable embedded MySQLi support... no checking for mysql_set_server_option in -lmysqlclient... no configure: error: wrong mysql library version or lib not found. Check config.log for more information. ----relivant part of config.log---- configure:59443: checking for MySQLi support configure:59489: checking whether to enable embedded MySQLi support configure:59635: checking for mysql_set_server_option in -lmysqlclient configure:59654: gcc -o conftest -I/usr/include -g -O2 -Wl,-rpath,/usr/lib/mysql -L/usr/lib/mysql -L/usr/lib -lmysqlclient -lz -lcrypt -lnsl -lm -lresolv -lresolv conftest.c -lmysqlclient -lresolv -lm -ldl -lnsl -lxml2 -lz -lm -lxml2 -lz -lm 1>&5 /usr/lib/mysql/libmysqlclient.a(ssl.o):(.gnu.linkonce.d.__vt_Q25yaSSL7Message+0x8): undefined reference to `__pure_virtual' /usr/lib/mysql/libmysqlclient.a(ssl.o):(.gnu.linkonce.d.__vt_Q25yaSSL7Message+0xc): undefined reference to `__pure_virtual' /usr/lib/mysql/libmysqlclient.a(ssl.o):(.gnu.linkonce.d.__vt_Q25yaSSL7Message+0x10): undefined reference to `__pure_virtual' /usr/lib/mysql/libmysqlclient.a(ssl.o):(.gnu.linkonce.d.__vt_Q25yaSSL7Message+0x14): undefined reference to `__pure_virtual' /usr/lib/mysql/libmysqlclient.a(ssl.o):(.gnu.linkonce.d.__vt_Q25yaSSL7Message+0x18): undefined reference to `__pure_virtual' /usr/lib/mysql/libmysqlclient.a(cert_wrapper.o): In function `yaSSL::x509::~x509(void)': (.text+0x57): undefined reference to `__builtin_delete' /usr/lib/mysql/libmysqlclient.a(cert_wrapper.o): In function `yaSSL::CertManager::~CertManager(void)': (.text+0x2ad): undefined reference to `__builtin_delete' /usr/lib/mysql/libmysqlclient.a(template_instnt.o): In function `mySTL::list<yaSSL::SSL_SESSION *>::~list(void)': .... It contiues like this for a sizable chunk of text more. Thanks NickPoole