The Xft library provides anti-aliased fonts for X11 which greatly enhances the look of Tk with X11.
It can be enabled for newer Tk versions by passing --enable-xft to configure when building Tk.
[add info about Xft , which I presume is a library interface to FreeType font handling.]
To add xft support to Tclkit, read the docs at [L1 ] about customization and the genkit.local script.