Problem building ARMHF Debian deb file

I am trying to install dbmail on a Cubieboard-2, which is an armhf system.

The Cubieboard-2 is installed using the standard debian-installer as a jessie
(i.e. currently testing) system.

I have installed all the dependencies, and git cloned the repository.  The 
only pre-req I had to adjust was on automake, the debian/control file says
automake1-9, but the earliest version available seems to be 1-14, so I 
changed the debian/control file to say simply automake.  I realise that this
may cause problems later on, but I seem to be failing long before this. 

But when I use dpkg-buildpackage I get:-

$dpkg-buildpackage
dpkg-buildpackage: source package dbmail
dpkg-buildpackage: source version 3.0.2-1
dpkg-buildpackage: source distribution oneiric
dpkg-buildpackage: source changed by Paul J Stevens <[email protected]>
dpkg-buildpackage: host architecture armhf
 dpkg-source --before-build dbmail
 fakeroot debian/rules clean
debian/rules:138: *** missing separator.  Stop.
dpkg-buildpackage: error: fakeroot debian/rules clean gave error exit status 2

Any idea as to why this might happen?

I also tried apt-get source dbmail but that gave:-

$apt-get source dbmail
Reading package lists... Done
Building dependency tree       
Reading state information... Done
WARNING: The following packages cannot be authenticated!
  dbmail
E: Some packages could not be authenticated

I am not sure how I get the source authenticated?  Anyone know?

David