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I have uploaded cups packages to the repos.
The whole cups server cannot be installed because of missing
dependencies, but cups-client is enough to print over a network
printer. The GUI gtklp can be used to have more control. Start it
with gtklp <filename>. The version 1.2.3 of gtklp has no fileopen-
dialog, as 1.2.7 has. But I cannot package 1.2.7 because libtool2
is missing in scratchbox.

This is how to configure your printer:

Create a file /etc/cups/client.conf:

ServerName <my_server>

Then create /etc/cups/lpoptions:

Default <printername given in cups-webinterface>

Copy the ppd of your printer (you can also use generic postscript,
or from a registered turboprint> to /usr/share/cups/model/

Then execute the following:

lpadmin -p ps -v socket://<serverip>:<port> -P /usr/share/cups/model/Generic-PostScript_Level_1_Printer-Postscript1.ppd -E

Replace socket://... with the address given in the cups-webinterface,
and give the path to the ppd with the -P option.

Now you can print with lp <filename> or gtklp <filename>