Hi ernia : Good work. clean chroot is good enough.
Yes, delete any file that's not needed.

there is not so much room for saving space: the whole package would be about 20 Mb and the only thing on which i could work on are sound-files, which are about 7M
i could cook a frozen-bubble-nosound and two different frozen-bubble-sounds packages which would enable sounds if installed, one with the 7Mb sounds and one with about half the size sounds (if they are not horrible, i have not tested it yet).
does slitaz handles conflicting packages in the receipt or somewhere else?
is there a post_uninstall routines somewhere?
or maybe i could just cook a frozen-bubble package and a frozen-bubble-nosound package, but how do i make them conflicting?

Instead of creating two conflicting packages, you can also split out just the "sound" files into another package. Add this package as an optional (SUGGESTED) dependency to frozen-bubbles. You can see any *-dev packages to see how to split effectively.

Use post_remove() to remove any files after uninstallation

thanks jozee
pre_remove() and post_remove() are undocumented in the cookbook receipt page:
http://doc.slitaz.org/en:cookbook:receipt
may i update the page?

Hi ernia

Feel free to update the page. Jozee's probably busy.

Paul

i'm having lot of trouble and i don't know if i'll have time to work on it in the next days, i will be very busy with real (and hard) life.
i want to share my work until now, i've packed frozen-bubble and dependency into an archive downloadable from here:
http://rapidshare.com/files/379321005/fb.tar.bz2.html
the package is splitten in 2 packages, frozen-bubble, with sound disabled, and frozen-bubble-sounds, which enables sounds in frozen bubble.
trying to reduce the package size i've reduced in quality some images and music files (the 2 packages are reduced from 20 Mb to 13 Mb), if you are dissatisfied with the quality of images and music you can rebuild frozen-bubble editing frozen-bubble receipt and commenting/improving the 2nd and 3d for cicle, don't touch the first one, is required to let frozen bubble work without sound files. perl-yaml is required only to build sdl-perl, if you just want to run frozen-bubble you don't need to install it.