More details on installation pre-requisites

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 <H2><A NAME="#Content">Content</A></H2>
 <UL>
 
 <H2><A NAME="#Content">Content</A></H2>
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+<LI><A HREF="#Prequisites">Prerequisites</A>

 <LI><A HREF="#Installation">Installation</A>
 <LI><A HREF="#Code">Code development and user environment</A>
 </UL>
 
 <HR>
 
 <LI><A HREF="#Installation">Installation</A>
 <LI><A HREF="#Code">Code development and user environment</A>
 </UL>
 
 <HR>
 

-<h2><A HREF="#Content" NAME="Installation">Installation</A></h2>
+<h2><A HREF="#Content" NAME="Prerequisites">Prerequisites</A></h2>
+
+<h3>Environment</h3>
+
+<p> The code is actively maintained on Linux and HP (both CC and aCC
+compilers). It also runs on Compaq OSF1 and SunOS. We welcome feedback from
+the installation on other systems and we will be happy to consider 
+modifications and corrections necessary to make the installation possible.
+
+<p> The disk space required for a full installation of AliRoot is 200MB for
+the system itself and 60MB for the ROOT system.
+
+<h3>gmake</h3>
+
+<p> The installation is performed via the <kbd>
+<a href="http://www.gnu.ai.mit.edu/manual/make-3.77/make.html">
+gmake</a></kbd> program. <kbd>gmake</kbd> is the 
+<a href="http://www.gnu.ai.mit.edu">GNU</a> version of make, it is free and,
+if missing on your machine, it can be loaded from the GNU Internet site 
+<a href="ftp://ftp.gnu.ai.mit.edu/pub/gnu/make">
+ftp://ftp.gnu.ai.mit.edu/pub/gnu/make</a>. <kbd>gmake</kbd> is compatible
+with the standard UNIX <kbd>make</kbd> and on the CERN ion WGS
+<kbd>make</kbd> is aliased to <kbd>gmake</kbd>. The only files you need for 
+<kbd>gmake</kbd> are the executable <kbd>gmake</kbd>
+and the script <kbd>autoconf</kbd>, therefore you can copy such files from
+any site in a directory in your path.
+
+<h3>ROOT</h3>
+
+<p> <em>ROOT</em> is available for many platforms, therefore in most cases
+no <em>ROOT</em> installation is required. To install ROOT on your machine,
+connect to the <a href="http://root.cern.ch">web site</a> and follow the
+link <em>downloads</em>. Usually you should get the latest release, unless
+announced differently by the news of the Off-line Project.
+
+<p> All you need to do is download the compressed tar file, that usually is
+called <var>root_v...tar.gz</var>uncompress and untar it (we supposed you
+downloaded the tar file in your <var>$HOME</var>):
+
+<p><kbd>
+$ gunzip root_v...tar.gz
+$ cd <i>directory</i> # name of the directory where you want ROOT to sit
+$ tar xvf ~/root_v...tar
+</kbd>
+
+<p> When tar ends, you will have the full root directory tree, with already
+installed libraries for your platform. 
+
+<p> The following shell variables should be defined in the login scripts:

 
 

+<p><table align=centre borders=no>
+<tr><th align=left>variable</th><th align=left>value</th></tr>
+<tr><td width=50%>ROOTSYS             </td><td> <i>directory</i>/root
+<tr><td colspan=2><i><center>on all systems but HP-UX</center></i></td></tr>
+<tr><td>LD_LIBRARY_PATH</td>
+<td>$LD_LIBRARY_PATH\:$ROOTSYS/lib</td></tr>
+<tr><td colspan=2><i><center>on HP-UX</center></i></td></tr>
+<tr><td>SHLIB_PATH</td>
+<td>$SHLIB_PATH\:$ROOTSYS/lib</td></tr>
+<tr><td>PATH</td>
+<td> $PATH\:$ROOTSYS/bin </td></tr>
+</table>
+
+
+<h2><A HREF="#Content" NAME="Installation">Installation</A></h2>

 
 <ol> 
 <p><li> Install <a href="http://root.cern.ch">ROOT</a> and define the
 
 <ol> 
 <p><li> Install <a href="http://root.cern.ch">ROOT</a> and define the