Comment 8 for bug 796454

more precisely, the icon message cames from:

+ /usr/bin/gtk-update-icon-cache -qf /usr/share/icons/Adwaita
gtk-update-icon-cache: No theme index file.

$ ls -l /usr/share/icons/Adwaita
total 8
drwxr-xr-x 2 root root 4096 juuni 13 20:02 cursors/