Add information about installing from source.

In case one installs from source, make, tar and gzip are also needed. tar and
gzip are almost always installed, but make not, so let's add a note about that.

Also remove a '>' in the apt-get install example so copy-paste works.

Reviewed-by: imsnah

INSTALL

@@ -31,6 +31,8 @@ Before installing, please verify that you have the following programs:
 
 For testing, you also need the YAML module for Python (http://pyyaml.org/).
 
+For building from source, you also need tar, gzip or bzip2 and make.
+
 
 Installation of the software
 ============================

docs/installing.sgml

@@ -212,8 +212,30 @@ m-a a-i drbd0.7
 
       <screen>
 # apt-get install lvm2 ssh bridge-utils iproute iputils-arping \
-> fping python2.4 python-twisted-core python-pyopenssl openssl
+  fping python2.4 python-twisted-core python-pyopenssl openssl
       </screen>
+
+      <para>
+        When installing from source, you will also need the following:
+      </para>
+      <itemizedlist>
+        <listitem>
+          <simpara>make</simpara>
+        </listitem>
+        <listitem>
+          <simpara>tar</simpara>
+        </listitem>
+        <listitem>
+          <simpara>gzip or bzip2</simpara>
+        </listitem>
+      </itemizedlist>
+
+      <para>
+        Again, these are available in most if not all linux distributions. For Debian, do:
+      <screen>
+# apt-get install make tar gzip bzip2
+      </screen>
+      </para>
     </sect2>
 
   </sect1>