I build it for Debian/Ubuntu on the build farm, and it seems to be building fine for me.
Do you build with -DBUILD_ALL=ON? Looks like you build with that option OFF:
http://git.trinitydesktop.org/cgit/tde- packaging/tree/ubuntu/raring/applications/kbfx/debian/rules
The default is OFF, which means -DBUILD_DOC=OFF and - DBUILD_TRANSLATIONS=OFF. When either -DBUILD_DOC=ON or - DBUILD_TRANSLATIONS=ON the build fails.
Darrell