Just change configuration below :
CGI Mode - PHP5 : /usr/local/directadmin/custombuild/configure/suphp/configure.php5
CGI Mode - PHP4 : /usr/local/directadmin/custombuild/configure/suphp/configure.php4
CLI Mode - PHP5: /usr/local/directadmin/custombuild/configure/ap2/configure.php5
CLI Mode - PHP4 : /usr/local/directadmin/custombuild/configure/ap2/configure.php4
Add "--with-snmp"
Then, compile with "./build php n" under /usr/local/directadmin/custombuild
You may need to have "net-snmp-devel" installed or compilation will fail.
Step 11 here is what I wrote up. English is not my primary language though. ->
http://www.bxtra.net/articles/2008-09-18/Steps-how-install-Cacti-CentOS-52-DirectAdmin
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Is Diazepam Dangerous