Problem running samba_backup from cron

[Taylor, Jonn]

I have a cron setup to run a backup every day at 2am. This is failing 
with the following.

/usr/sbin/samba_backup: line 69: tdbbackup: command not found
Error while backing up ./private/secrets.ldb - status 127

If I run it manually it works fine. This is on CentOS 6 x86_64. Samba is 
installed in /usr/local/samba.

This is the wiki page I used to setup the backup.

https://wiki.samba.org/index.php/Backup_and_Recovery

Jonn