Compiling php with the --with-gdbm php will build and install properly, and with no warnings, claiming to be adding gdbm functionality, but attempts to use the dbmopen() command results in a fatal error message of "Call to undefined function: dbmopen() in /www/htdocs/test/dbm.html on line x"

line producing the error is:

$dbm = dbmopen ("lastseen", "w");

This problem did not exist with 4.0.0 through 4.0.2

configure line:

./configure --with-apxs=/www/bin/apxs --with-gdbm

php.ini is stock