clarify under what conditions you can compile without GDAL

git-svn-id: http://svn.osgeo.org/postgis/trunk@11329 b70326c6-7e19-0410-871a-916f4a2858ee

diff --git a/doc/installation.xml b/doc/installation.xml
index 125a19b355287881dec4838ed8dd94a26f54d029..f638569d9a1b5fda5b0d0172c236174590acd59e 100644 (file)
--- a/doc/installation.xml
+++ b/doc/installation.xml
@@ -129,7 +129,7 @@ in the docs folder
          
          <listitem>
                <para>
-                 GDAL, version 1.8 or higher (1.9 or higher is strongly recommended since some things will not work well or behavior differently with lower versions).  This is required for raster support.
+                 GDAL, version 1.8 or higher (1.9 or higher is strongly recommended since some things will not work well or behavior differently with lower versions).  This is required for raster support and to be able to install with <code>CREATE EXTENSION postgis</code> so highly recommended for those running 9.1+.
                  <ulink url="http://trac.osgeo.org/gdal/wiki/DownloadSource">http://trac.osgeo.org/gdal/wiki/DownloadSource</ulink>.
                </para>
          </listitem>
@@ -140,6 +140,11 @@ in the docs folder
        </para>
 
        <itemizedlist>
+       <listitem>
+               <para>
+                 GDAL (pseudo optional) only if you don't want raster and don't care about installing with <code>CREATE EXTENSION postgis</code> can you leave it out.
+               </para>
+         </listitem>   
          <listitem>
                <para>
                  GTK (requires GTK+2.0, 2.8+) to compile the shp2pgsql-gui shape file loader.