You have to edit the .cdsinit file at your work directory(the directory where you launch IC) Copy the sample from Cadence install directory to your work directory and add some skill code for Mentor Calibre. Thenm you can see Calibre tabs integrated in Virtuoso. If you want, I will send the code by e-mail or something. I am using IC5033+Cal2005.1_10.20 on Sparc.
I had this working on SuSE 9.2 but recently upgraded to SuSE 10.0. The skill code is run.. the menu's appear.. but when you try "Run DRC" it doesnt work. It is NOT a license issue.