[ubuntu-uk] Building module ....

[Barry Drake]

Hi there ...  I want to use a fax on my desktop computer.  I'm running 
15.04 testing.  I bought a USB fax modem with Conexant chipset - Linux 
compatible.  The enclosed disk has a .deb driver package.  So far so 
good ....  On trying to use the package, I get the following error:
No pre-built modules for: Ubuntu-Vivid linux-3.16.0-28-generic x86_64-SMP
Trying to automatically build the driver modules...
Building modules for kernel 3.16.0-28-generic, using source directory 
/lib/modules/3.16.0-28-generic/build.

It then throws the following fatal error:
make[1]: Entering directory '/usr/src/linux-headers-3.16.0-28-generic'
   CC [M]  /usr/lib/dgcmodem/modules/mod_dgcusbdcp.o
In file included from /usr/lib/dgcmodem/modules/mod_dgcusbdcp.c:57:0:
/usr/lib/dgcmodem/modules/GPL/oscompat.h:125:24: fatal error: 
asm/system.h: No such file or directory
  #include <asm/system.h>

Looking around, I see that this header is no longer current.  I have no 
idea what it contains, and can find very little help online as to what 
information this header used to contain.  Any ideas please?

Kind regards,        Barry.