How to customize dhcrelay v6 PID file location?

[sangeeta.misra at oracle.com]

Unlike dhcpd, the CLI of dhcrelay does not allow user to specify  PID 
files.
Furthemore  the configure script provides " --with-relay-pid-file" 
option which only works for dhcrelay V4.   Although dhcpd.h has these:
============
dhcpd.h:#ifndef _PATH_DHCRELAY_PID
dhcpd.h:#define _PATH_DHCRELAY_PID    LOCALSTATEDIR"/run/dhcrelay.pid"
dhcpd.h:#ifndef _PATH_DHCRELAY6_PID
dhcpd.h:#define _PATH_DHCRELAY6_PID    LOCALSTATEDIR"/run/dhcrelay6.pid"
==================
the user has no control over the location and name of the pid file ( ie 
the "run/dhcrelay6.pid" cannot be modified.

Does anyone have a workaround or patch for this?

Sangeeta