How to create an upstream tarball for the gdal-grass plugin
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The gdal-grass source tarball can be generated starting from
the gdal debianized source as follows:

apt-get source gdal
dpkg-source -x gdal_*-*.dsc
cd gdal-*
debian/rules gdal-grass

It will generate a gdal-grass upstream tarball in the directory
where you unpack the Debian sources.

The gdal source provides the gdal-grass stanza since 1.5.2-1,
with previous versions you need to create the tarball by
configuring the package and run `make dist' within the
frmts/grass directory.