base system vs. isc-dhcp : dhclient conflicts?

[Rob]

Hello,

I have isc-dhcp3 port installed on my 4.9-Stable PC.
I need that as I want to configure this machine as
both, a DHCP client and server.

I notice, that I have two versions of dhclient related
files (see below). Is this a problem and reason for
possible conflicts? What can I do to avoid multiple
versions of dhclient related files?

Is there a make.conf option that will prevent the build
of dhclient in the base system?

I don't know which dhclient to use, the one in /sbin
or the one in /usr/local/sbin. And which dhclient.conf
file to modify.

Thanks for help,
Rob.

------

/sbin/dhclient
/usr/local/sbin/dhclient

/sbin/dhclient-script
/usr/local/sbin/dhclient-script

/etc/dhclient.conf
/usr/local/etc/dhclient.conf

/usr/share/man/man5/dhclient.conf.5.gz
/usr/local/man/man5/dhclient.conf.5.gz

/usr/share/man/man5/dhclient.leases.5.gz
/usr/local/man/man5/dhclient.leases.5.gz

/usr/share/man/man8/dhclient-script.8.gz
/usr/local/man/man8/dhclient-script.8.gz

/usr/share/man/man8/dhclient.8.gz
/usr/local/man/man8/dhclient.8.gz