"DSO load failed" when using mod_authn_dbm for Berkeley DB

[Tianyin Xu <tixu@xxxxxxxxxxx>]

Hi,

I'm trying to use mod_authn_dbm, and referring to
https://httpd.apache.org/docs/current/mod/mod_authn_dbm.html

I used dbmmanger to generate the dbm file named dbm-auth-file.
$ file dbm-auth-file
dbm-auth-file: Berkeley DB (Hash, version 9, native byte-order)

According to the manual, the value of AuthDBMType could be "default|SDBM|GDBM|NDBM|DB".

Is "DB" here refer to Berkeley DB?

I set "AuthDBMType DB" and see the following errors in my error_log:
[Thu May 05 18:12:29.915467 2016] [authn_dbm:error] [pid 9107:tid 140031532377856] (20019)DSO load failed: [client 127.0.0.1:54442] AH01754: could not open dbm (type DB) auth file: /home/tixu/httpd-2.4.20-bin/dbm-auth-file

(and the client gets 500 Internal Service Error as you can expected)

Does anyone know about this?

Thanks!

~t