MySQL BIND SDB Driver

I'm trying to compile MySQL SDB with BIND v9.4.2 and MySQL v4.1.22. MySQL is installed and functioning fine. I've followed the README file with MySQL SDB and done:

- copied mysqldb.c to bind-9.4.2/bin/named/
- copied mysqldb.h to bind-9.4.2/bin/named/include/
- set the following in bind-9.4.2/bin/named/Makefile.in

DBDRIVER_OBJS = mysqldb.@O@
DBDRIVER_SRCS = mysqldb.c
DBDRIVER_INCLUDES = -I'/usr/include/mysql'
DBDRIVER_LIBS = -L'/usr/lib/mysql' -lmysqlclient -lz -lcrypt -lnsl -lm

I've added the following to bind-9.4.2/bin/named/main.c - #include "mysqldb.h"

When it states about registering the driver, I've added "mysqldb_init();" to line 694 of main.c just before the line: ns_server_create(ns_g_mctx, &ns_g_server);

When it states about unregistration, I've added "mysqldb_clear();" to line 705 of main.c just after the line:
ns_server_destroy(&ns_g_server);

I compile BIND with the following:
CFLAGS="-O2 -march=i386" ./configure --prefix=/usr --sysconfdir=/etc/bind --localstatedir=/var --with-libtool --enable-shared --enable-threads --with-openssl=/usr

When I run 'make' it bombs out with the following error:

t -Wpointer-arith -fno-strict-aliasing -c mysqldb.c -fPIC -DPIC -o .libs/mysqldb.o
mysqldb.c:41:27: named/mysqldb.h: No such file or directory
mysqldb.c:456: warning: no previous prototype for 'mysqldb_init'
mysqldb.c:467: warning: no previous prototype for 'mysqldb_clear'
mysqldb.c:131: warning: 'quotestring' defined but not used
make[2]: *** [mysqldb.lo] Error 1
make[2]: Leaving directory `/packages/bind-9.4.2/bin/named'
make[1]: *** [subdirs] Error 1
make[1]: Leaving directory `/packages/bind-9.4.2/bin'
make: *** [subdirs] Error 1

I've tried modified the path to mysqldb.h but it still bombs out. Can anyone help me out here?

Many thanks.

Stuart.