dahdi-dkms is not compiling correct

[Oseias]

$ lsb_release -rd
Description: Ubuntu 13.10
Release: 13.10

$ apt-cache policy dahdi-dkms
dahdi-dkms:
  Instaled: 1:2.5.0.1+dfsg-1ubuntu3
  Candidate: 1:2.5.0.1+dfsg-1ubuntu3

on /usr/src/dahdi-2.5.0.1+dfsg-1ubuntu3/dkms.conf

MAKE[0]="(make modules KERNVER=$kernelver …"

But on /usr/src/dahdi-2.5.0.1+dfsg-1ubuntu3/Makefile kernel version is set using KVERS variable.

ifndef KVERS
KVERS:=$(shell uname -r)
endif

Consequently modules was builded using current kernel headers.
On kernel upgrade, compiled modules don't work correctly on new kernel.

$ uname -a
Linux myhostname 3.11.0-14-generic #21-Ubuntu SMP Tue Nov 12 17:04:55 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

$ modinfo dahdi
filename: /lib/modules/3.11.0-14-generic/updates/dkms/dahdi.ko
alias: dahdi_dummy
license: GPL v2
description: DAHDI Telephony Interface
author: Mark Spencer <email address hidden>
version: 2.5.0.1
srcversion: C983F7FD45B28D0A501EEE0
depends: crc-ccitt
vermagic: 3.11.0-13-generic SMP mod_unload modversions
parm: debug:Sets debugging verbosity as a bitfield, to see general debugging set this to 1. To see RBS debugging set this to 32 (int)
parm: deftaps:int
parm: max_pseudo_channels:Maximum number of pseudo channels. (int)
parm: hwec_overrides_swec:When true, a hardware echo canceller is used instead of configured SWEC. (int)

Needs rebuild modules after boot with new kernel:

$ sudo dkms remove -m dahdi/2.5.0.1+dfsg-1ubuntu3 -k $(uname -r)
$ sudo dkms install -m dahdi/2.5.0.1+dfsg-1ubuntu3 -k $(uname -r)