how do I create orig.tar.gz archive ?

[Ionutz Borcoman <borco@borco-ei.eng.hokudai.ac.jp>]

Hi,

I am trying to package vdk-0.5.1 but I have some problems.

The original archive is vdk_0_5_1.tar.gz with a top directory VDK-0.5.1.

The current version of vdk is a developement version and I've decided to
call it: vdk-0.5.1-19990122 (using the release day of the library).
Building the package, I get a tar.gz called vdk-0.5.1.orig.tar.gz. The
top directory of this archive is vdk-0.5.1-19990122. 

Question:
how do I force dpkg-build to create a vdk_0_5_1.orig.tar.gz with a top
directory VDK-0.5.1 ?

Is this important ?

Beside these changed names, the vdk-0.5.1.orig.tar.gz is identical with
the original archive and I get just one warning from lintian (for the
way I format the Description text
).

TIA,

Ionutz