Why aren't the root plugins installed?
There are a few plugins which require root access, namely check_dhcp and
check_icmp.  These are compiled under the plugins-root subdirectory.  A
make install will install them with the install user's owner and group
permissions.  However, if you run make install without being root, this
message will appear:
WARNING: insufficient access; not installing setuid plugins
NOTE: to install setuid plugins, run 'make install-root' as root
To install, run as root:
$ make install-root
Even if you are not root, the plugins will still be installed. This is for packagers which can then alter the permissions of the plugins before packaging.
This behaviour is used by coreutils for the su binary and is duplicated for
this project.
