quilt versioned build-depend makes no sence. The better way is to provide a more detailed explanation in debian/README.source which quilt version has README.source. Signed-off-by: Modestas Vainius <modestas@vainius.eu>
This package uses quilt for upstream source code patch management. Please read /usr/share/doc/quilt/README.source for more information how to apply, unapply, add, modify or remove patches. Please note that /usr/share/doc/quilt/README.source is only available in quilt version 0.46-4.1 or later.