compiler error while compiling php4.0.0 --with-apxs --with-ibm-db2

/bin/sh /home/dfallon/php-4.0.0/libtool --silent --mode=link
gcc -g -O2 -Wall   -o libphp4.la -rpath
/home/dfallon/php-4.0.0/libs -avoid-version   main.lo internal_functions.lo
snprintf.lo php_sprintf.lo configuration-parser.lo configuration-scanner.lo
safe_mode.lo fopen-wrappers.lo php_realpath.lo alloca.lo php_ini.lo SAPI.lo
rfc1867.lo php_content_types.lo strlcpy.lo strlcat.lo mergesort.lo
reentrancy.lo php_variables.lo php_ticks.lo php_virtual_cwd.lo
Zend/libZend.la sapi/apache/libsapi.la regex/libregex.la ext/db/libdb.la
ext/gd/libgd.la ext/mysql/libmysql.la ext/odbc/libodbc.la
ext/pcre/libpcre.la ext/posix/libposix.la ext/session/libsession.la
ext/standard/libstandard.la
ext/xml/libxml.la  -lgdbm -ldb2 -lpam -ldl -lgd -lresolv -lm -ldl -lcrypt -l
nsl -lresolv
/usr/bin/ld: cannot open -ldb2: No such file or directory
collect2: ld returned 1 exit status
make[1]: *** [libphp4.la] Error 1
make[1]: Leaving directory `/home/dfallon/php-4.0.0'
make: *** [all-recursive] Error 1

Any thoughts?