Hi, been also having issues of kbfx... (Slackware 10.2 aswell)
After some trying I figured out the damn configure script didn't work pretty well and my makefiles crashed because they tried to run automake-1.6 (while I had 1.9), aclocal-1.6 (same) and /usr/bin/kcompilerorsomething (while it was /opt/kde/bin/kde...)
I manually edited the values and got the compiler to work without errors, though huge amounts of warmings did still pop up due to a not so talented coder?
Anyway, got it compiled and installed, though only the applet works, somehow it didn't install my ~/.kbfx/ dir so no new bar yet. I really hope they improve the kbfx packages cause this ain't fun anymore to compile:P