Zoom mini usb dial up modem model 3095 driver install problem

[squareyes]

Hi all,
just acquired a Zoom mini usb dial up modem model 3095.
It came with cd including a  driver (.deb) for Linux (conexant) and a .tar
Tried to install .deb as per instructions, I get as below. I have build 
essentials installed.

squareyes at here:~$ sudo dpkg -i dgcmodem_i386.deb
(Reading database ... 113953 files and directories currently installed.)
Preparing to replace dgcmodem 1.01 (using dgcmodem_i386.deb) ...

************************************************************************
*
* The update-modules command is deprecated and should not be used!
*
************************************************************************

Unpacking replacement dgcmodem ...
Setting up dgcmodem (1.01) ...
Conexant DGC USB modem driver, version 1.01

If you need assistance or more information, please go to:
    http://www.linuxant.com/

When reporting a problem for the first time, please send
us the file generated by "dgcconfig --dumpdiag".

No pre-built modules for: Ubuntu-8.04 linux-2.6.24-16-generic i686-SMP

Trying to automatically build the driver modules...
(this requires a C compiler and proper kernel sources to be installed)

Where is the linux source build directory that matches your running kernel?
[/lib/modules/2.6.24-16-generic/build]

Building modules for kernel 2.6.24-16-generic, using source directory
/lib/modules/2.6.24-16-generic/build. Please wait...

ERROR: Module build failed!
Please examine the log file "/tmp/dgcconfig-buildlog.txt" to determine why.

I get the same when I try to install with tar file

tmp/dgcconfig-buildlog.txt is as below.

(cd /lib/modules/2.6.24-16-generic/build && make 
"CNXT_KERNELSRC=/lib/modules/2.6.24-16-generic/build" 
"M=/usr/lib/dgcmodem/modules" "CC=gcc" clean)
make[1]: Entering directory `/usr/src/linux-headers-2.6.24-16-generic'
make[1]: Leaving directory `/usr/src/linux-headers-2.6.24-16-generic'
rm -rf *.o GPL/*.o *.ko GPL/*.ko *.mod.c GPL/*.mod.c .*.cmd GPL/.*.cmd 
.tmp_versions .tmp_versions  
/lib/modules/2.6.24-16-generic/build/.tmp_versions/dgcusbdcp.mod 
Modules.symvers GPL/hda/Modules.symvers
(cd /lib/modules/2.6.24-16-generic/build && make 
"CNXT_KERNELSRC=/lib/modules/2.6.24-16-generic/build" 
"M=/usr/lib/dgcmodem/modules" "CC=gcc" modules)
make[1]: Entering directory `/usr/src/linux-headers-2.6.24-16-generic'
scripts/Makefile.build:46: *** CFLAGS was changed in 
"/usr/lib/dgcmodem/modules/Makefile". Fix it to use EXTRA_CFLAGS.  Stop.
make[1]: *** [_module_/usr/lib/dgcmodem/modules] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-2.6.24-16-generic'
make: *** [all] Error 2

There isn't much I understand re the above file, any help most appreciated.
Thanks in advance
Take Care
Winton