adding a section about prerequisites

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@415 44740490-163a-0410-bde0-09ae8108e29a

docs/source/simplesamlphp-install.xml

@@ -7,7 +7,7 @@
   <articleinfo>
     <date>2007-08-30</date>
 
-    <pubdate>Fri Mar 14 10:39:49 2008</pubdate>
+    <pubdate>Tue Mar 11 21:00:08 2008</pubdate>
 
     <author>
       <firstname>Andreas Åkre</firstname>
@@ -30,6 +30,18 @@
     url="http://rnd.feide.no/simplesamlphp">http://rnd.feide.no/simplesamlphp</ulink></para>
   </section>
 
+  <section>
+    <title>Prerequisites</title>
+
+    <para>PHP version &gt;= 5.1.2. If you want to run the Shibboleth 1.3 part
+    of simpleSAMLphp, you must have PHP &gt;= 5.2.</para>
+
+    <para>Apache or some other webserver.</para>
+
+    <para>simpleSAMLphp is mostly tested on different Linux, Unix, and Mac OS
+    X, but someone has also made it work on Windows.</para>
+  </section>
+
   <section>
     <title>Download and install simpleSAMLphp</title>
 
@@ -203,6 +215,17 @@ cp -r metadata-templates/*.php metadata/
         </mediaobject>
       </screenshot>
     </figure>
+
+    <section>
+      <title>Check your PHP environment</title>
+
+      <para>On the bottom of the installation page there is some green lights.
+      simpleSAML runs some tests to see whether required and reccomended
+      prerequisites are met. If you see some red lights, there might be
+      neccessary to add some extensions or modules to PHP. In example you
+      would need PHP LDAP extension to use the LDAP authentication
+      module.</para>
+    </section>
   </section>
 
   <section>