No inital plugin directory - unable to install plugins

[format_c]

Hi all,

I've some problems to install plugins.
First of all I've read the Plugin install document on cactiusers.org.

But the instructions slightly differ with my cacti installation environment(0.8.6j).
1. I do not have an "plugins" directory even in the tarball archive.
2. I did not have an initial "$plugins = array();" statement in my "inlcude/config.php".
3. I do not have such a "plugin" (I don't know how it's called 'cause I do not have one) option in my Realm Permissions in the User Management section of cacti.

So that's what I did to install the plugin:
I created the plugins directory under the cacti directory and extracted copied the plugin into that directory. I added the $plugins = array(); and the $plugins[] = 'monitor'; statement into the include/config.php file but can't recognize any change on the surface.

Could somebody tell me what I've been doing wrong?

Cheers Alex

[format_c]

Sorry for scattering.
I'd have to patch cacti with the cacti-plugins-arch patch that can be found on cactiusers.org