hata_ph has packaged dia for VL 5.9.
Package Size: 2.770 MB
Installed Size: 15.720 MB
dia: dia (A gtk+ based diagram creation program)
dia: Dia is a GTK+ based diagram creation program for Linux, Unix
dia: and Windows released under the GPL license.
dia: License: GPL
dia: Authors: Alexander Larsson, firstname.lastname@example.org
dia: Website: http://www.gnome.org/projects/dia/
After testing this package, please take a moment and come back to this thread to let us know how it works for you.