libav-tools throws warnings while installing

[Peter Lemieux]

Kubuntu 14.04 updated through 7/4/14
Libav version: 6:9.13-0ubuntu0.14.04.1

During the installation of libav-tools, dpkg complains as follows:

Preparing to unpack .../libav-tools_6%3a9.13-0ubuntu0.14.04.1_i386.deb ...
dpkg: error: --compare-versions takes three arguments: <version> <relation> <version>

Type dpkg --help for help about installing and deinstalling packages [*];
Use 'apt' or 'aptitude' for user-friendly package management;
Type dpkg -Dhelp for a list of dpkg debug flag values;
Type dpkg --force-help for a list of forcing options;
Type dpkg-deb --help for help about manipulating *.deb files;

Options marked [*] produce a lot of output - pipe it through 'less' or 'more' !
Unpacking libav-tools (6:9.13-0ubuntu0.14.04.1) ...

As far as I can tell, the software is correctly installed despite these complaints.