Add a prerequisite section to the README (szabgab++). Update copyright.

README

@@ -1,7 +1,7 @@
 Rakudo Perl 6
     This is Rakudo Perl, a Perl 6 compiler for the Parrot virtual machine.
 
-    Rakudo Perl is Copyright (C) 2008-2011, The Perl Foundation. Rakudo Perl
+    Rakudo Perl is Copyright (C) 2008-2012, The Perl Foundation. Rakudo Perl
     is distributed under the terms of the Artistic License 2.0. For more
     details, see the full text of the license in the file LICENSE.
 
@@ -14,6 +14,29 @@ Rakudo Perl 6
     For a high-level overview of implemented and missing features,
     please visit http://perl6.org/compilers/features .
 
+  Prerequisites
+    To build Rakudo you need at least a C compiler, a 'make' utility,
+    and Perl 5.8.4 or newer.  You probably also want a machine with a fair
+    amount of memory available: 1GB is known to be too small for building 
+    Rakudo, while 2GB is generally known to be sufficient.
+
+    In order to fully support Unicode, you'll also want to have the
+    ICU library installed (http://site.icu-project.org/).
+    Rakudo can run without ICU, but some Unicode-related features
+    will not work properly.
+
+    On Debian GNU/Linux or Ubuntu Linux, the necessary components
+    for building Rakudo can be installed via the command
+
+        aptitude install make gcc libicu-dev
+
+    Readline support also requires the "libreadline-dev" library.
+
+    On RedHat/Fedora/CentOS, the components can be installed with
+
+        yum groupinstall development-tools
+        yum install libicu-devel readline-devel
+
   Building Rakudo
     See the INSTALL.txt file for detailed prerequisites and build and
     installation instructions. The short version is