diff --git a/doc/installation.xml b/doc/installation.xml
index b2ab32dd2..40bbe4998 100644
--- a/doc/installation.xml
+++ b/doc/installation.xml
@@ -163,9 +163,9 @@ ldconfig</programlisting>
 		
 		<listitem>
 			<para>If you are missing proj based on above or running a version below 4.5, then install by following these steps.</para>
-			<programlisting>wget http://download.osgeo.org/proj/proj-4.6.0.tar.gz
-tar xvzf proj-4.6.0.tar.gz
-cd proj-4.6.0
+			<programlisting>wget http://download.osgeo.org/proj/proj-&last_proj_release_version;.tar.gz
+gzip -d -c proj-&last_proj_release_version;.tar.gz | tar xvf -
+cd proj-&last_proj_release_version;
 ./configure &amp;&amp; make clean &amp;&amp; make
 make install
 ldconfig
@@ -174,9 +174,9 @@ cd ..</programlisting>
 		
 		<listitem>
 			<para>If you are missing geos based on above or running a version below 3.0, then install by following these steps.</para>
-			<programlisting>wget http://download.osgeo.org/geos/geos-3.0.3.tar.bz2
-tar xvjf geos-3.0.3.tar.bz2
-cd geos-3.0.3
+			<programlisting>wget http://download.osgeo.org/geos/geos-&last_geos_release_version;.tar.bz2
+bunzip2 -d -c geos-&last_geos_release_version;.tar.bz2 | tar xvf -
+cd geos-&last_geos_release_version;
 ./configure &amp;&amp; make clean &amp;&amp; make
 make install
 ldconfig
diff --git a/doc/postgis.xml b/doc/postgis.xml
index 77d10eef6..2a4994d06 100644
--- a/doc/postgis.xml
+++ b/doc/postgis.xml
@@ -2,7 +2,13 @@
 <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
 "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
 
+<!-- This value is automatically generated by the Makefile -->
 <!ENTITY last_release_version "@@LAST_RELEASE_VERSION@@">
+
+<!-- Change these values to update the version numbers referenced within the documentation -->
+<!ENTITY last_proj_release_version "4.6.1">
+<!ENTITY last_geos_release_version "3.0.3">
+
 <!ENTITY introduction SYSTEM "introduction.xml">
 <!ENTITY installation SYSTEM "installation.xml">
 <!ENTITY faq SYSTEM "faq.xml">