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[STR New]

This might not be an FLTK issue; check to see if kdesu is setting some
environment variable that is somehow messing up fltk's ability to access
fonts. You might try adding a line like:

system("printenv > /var/tmp/foo");

in your FLTK program, and compare the contents of /var/tmp/foo when
invoked from kdesu vs. sudo, to see if there's any critical variables
being set (LOCALE, etc) that is causing the trouble, and if so, possibly
modify your app to look for this problem and prevent it.

I'm not sure, just chiming in..

Link: http://www.fltk.org/str.php?L1605
Version: 1.1.7