By default Perl/Tk makes use of client side fonts via freetype2,
fontconfig and Xft on Unix systems. This gives anti-aliased fonts for
regular text (if you have TrueType or Type1 fonts and they are in your
fontconfig config file). See also http://fontconfig.org .
To disable this feature run the Makefile.PL
with "perl Makefile.PL XFT=0".