Version: 4.3.85 (using Devel) Installed from: Compiled sources when building kdebase: -- The following OPTIONAL packages could NOT be located on your system. -- Consider installing them to enable more features from this software. ----------------------------------------------------------------------------- * Shared desktop ontologies <http://oscaf.sourceforge.net> Desktop ontologies Ontologies necessary for the Nepomuk semantic desktop. CMake Error in apps/dolphin/src/CMakeLists.txt: Cannot find source file "nfo.trig". Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp .hxx .in .txx ...and of course build fails. Needless to say I would opt to keep the dependency truly optional.