talk about KDE4_UPDATE_ICONCACHE(), see http://techbase.kde.org/Development/CMake/Addons_for_KDE#The_locations_of_install_directories --Tstaerk 15:40, 18 September 2011 (BST)
observation:
rm /usr/local/share/icons/hicolor/scalable/apps/tutorial-kicon.svgz rm -rf /var/tmp/kdecache-root/icon-cache.kcache tutorial-kicon
cd /root/kdeexamples/kicons rm -rf /root/kdeexamples/kicons/* git checkout . cmake . && make && make install && tutorial-kicon
You will see that there is no icon shown, although available.