Package: system-config-printer
Version:1.0.0-3

Fragment from my buildlog:

desktop-file-install \
--dir /data/tparker/src/system-config-printer-1.0.0/debian/tmp//usr/share/applications/
\
--add-category System \
--add-category Settings \
--add-category HardwareSettings \
--add-category Printing \
--add-category GTK \
system-config-printer.desktop
Must specify the vendor namespace for these files with --vendor
make[3]: *** [install-desktopDATA] Error 1