Description:
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I'm trying to build mysqli as a shared extension in PHP 5.0.3 against MySQL 4.1.10, and configure complains:

./configure --with-mysqli=/usr/bin/mysql_config
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
checking for gcc... gcc
checking for C compiler default output... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... 
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ANSI C... none needed
checking whether gcc and cc understand -c and -o together... yes
checking if compiler supports -R... no
checking if compiler supports -Wl,-rpath,... yes
checking for PHP prefix... /usr
checking for PHP includes... -I/usr/include/php -I/usr/include/php/main -I/usr/include/php/Zend -I/usr/include/php/TSRM
checking for PHP extension directory... /usr/lib/php/extensions/no-debug-non-zts-20041030
checking for re2c... exit 0;
checking for gawk... gawk
checking for MySQLi support... yes, shared
checking whether to enable embedded MySQLi support... no
checking for mysql_set_server_option in -lmysqlclient... yes
checking for mysql_stmt_field_count in -lmysqlclient... no
configure: error: MySQLI doesn't support versions < 4.1.3 (for MySQL 4.1.x) and < 5.0.1 for (MySQL 5.0.x) anymore. Please update your libraries.

Here's the output from mysql_config:

papiamentu-liamr:; mysql_config
Usage: /usr/bin/mysql_config [OPTIONS]
Options:
        --cflags         [-I/usr/include/mysql]
        --include        [-I/usr/include/mysql]
        --libs           [-L/usr/lib/mysql -lmysqlclient -lz -lcrypt -lnsl -lm -L/usr/lib -lssl -lcrypto]
        --libs_r         [-L/usr/lib/mysql -lmysqlclient_r -lz -lpthread -lcrypt -lnsl -lm -lpthread -L/usr/lib -lssl -lcrypto]
        --socket         [/var/mysql/run/mysql.sock]
        --port           [3306]
        --version        [4.1.10]
        --libmysqld-libs [-L/usr/lib/mysql -lmysqld -lpthread -lcrypt -lnsl -lm -lpthread -lrt]


I get the same result if I try to configure php w/ mysqli:

papiamentu-liamr:; pwd
/usr/src/php-5.0.3
papiamentu-liamr:; ./configure --with-mysqli=shared,/usr/bin/mysql_config
creating cache ./config.cache
checking host system type... i686-pc-linux-gnu
Updated main/php_version.h
****SNIP****
checking for MySQLi support... yes, shared
checking whether to enable embedded MySQLi support... no
checking for mysql_set_server_option in -lmysqlclient... yes
checking for mysql_stmt_field_count in -lmysqlclient... no
configure: error: MySQLI doesn't support versions < 4.1.3 (for MySQL 4.1.x) and < 5.0.1 for (MySQL 5.0.x) anymore. Please update your libraries.

It seems to work if I build it w/ mysqli build into the php binary:
papiamentu-liamr:; ./configure --with-mysqli=/usr/bin/mysql_config
creating cache ./config.cache
checking host system type... i686-pc-linux-gnu
Updated main/php_version.h
****SNIP****
checking for MySQLi support... yes
checking whether to enable embedded MySQLi support... no
checking for mysql_set_server_option in -lmysqlclient... yes
checking for mysql_stmt_field_count in -lmysqlclient... yes