NoGo : yum-presto has been obsoleted.

Don't know what to tell you.
I have two F18 boxes that are both using the presto plugin for yum.

Linux dw-agagne 3.8.5-201.fc18.x86_64 #1 SMP Thu Mar 28 21:01:19 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

Alan