I installed 4 components from the update site http://www.apache.org/dist/ant/ivyde/updatesite mentioned on Apache IvyDE™ > Download including a restart of Eclipse:
They are displayed in Help → Installation Details → Installed Software.
There is an Ant section but no Ivy section in Window → Preferences.
Is there anything else I have to do?
The only solution I found (and I didn't find it, in fact, I tried it because I didn't find any other solution) was to: