As can be seen in #611438 for example there is a desire for other
packages to request additional options. Once dhclient requests them they
are easily processed, because dhclient provides a directory for hooks
which is already used by a number of packages (resolvconf, ntp, samba,
...). However if a package needs more variables than those provided, it
is currently out of luck. As you may have guessed I ran into this issue
on my own. Instead of filing my request for a special option, I turn
this issue into a general one. Currently the only way for a package to
request additional options is to extend /etc/dhcp/dhclient.conf in
postinst and revert those changes in postrm purge. Of course such
scripts violate policy. To solve this issue a conf.d style approach
would be desirable.

Helmut

Dear submitter,

as the package isc-dhcp has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/1143544

The version of this package that was in Debian prior to this removal
can still be found using https://snapshot.debian.org/.

Please note that the changes have been done on the master archive and
will not propagate to any mirrors until the next dinstall run at the
earliest.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Thorsten Alteholz (the ftpmaster behind the curtain)