Your comments

Thank you, the point is that the binary already existed, so the problem was that one needs to restart the services for Ajenti to pick it up..
Ahh, hang on. I seem to have solved the problem by restarting the service and restarting Ajenti. Great, I am beginning to really like this little panel, very nice.
Hi there,

I know this post is quite old, but I am also confused.

I have installed Apache, and can see httpd is running, but the Apache plugin has a triangle exclamation mark next to it, with the message "Application binary" depends on "httpd".

There doesn't seem to be a clear way to fix this dependency. I'm sure it must be something obvious, unfortunately I don't understand the previous reply:

Then you can check if each one is accessible by running `which <app name>`

Where do we need to run this? 

I installed Apache with the Ajenti "packages" installer.

I can see that on certain plugins, like CTDB, there is a little download button to install the dependency directly, so I'm guessing the fact this download option doesn't exist for Apache, it can't be downloaded from there.

I have installed Ajenti in a Centos 6.5 environment, and can access the Apache 2 success page when viewing the website address, so this error is confusing..

Can anyone offer a bit of insight?