[Koha] Apology and install problem

First, I'd like to apologize for my previous questions. Somehow I had inadvertently installed Koha 3 Alpha. I don't know how I did this or how I didn't realize I'd done this even though the tar file and installation folder were clearly labeled so. My only excuse is that I'm new to all this. Now I have removed it and am attempting to install RC 1. The first thing I saw when running Makefile.PL was that I had to install additional Perl modules, which I did. Now I get the following error: Writing Makefile for koha Unable to open MakeMaker.tmp: Permission denied at /usr/share/perl/5.8/ExtUtils/MakeMaker.pm line 878. Where do I go from here? Paul