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:

• KDE4_UPDATE_ICONCACHE() is missing in CMakeLists from git.kde.org/kdeexamples/kicons

• after the first clone, build and install, there is no appropriate icon for tutorial-kicon

• you can restore this state:
  • tell the icon cache that there is no icon available

rm /usr/local/share/icons/hicolor/scalable/apps/tutorial-kicon.svgz 
rm -rf /var/tmp/kdecache-root/icon-cache.kcache
tutorial-kicon

• • redo the compile

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.