Added GEOS support tips to installation instructions

git-svn-id: http://svn.osgeo.org/postgis/trunk@349 b70326c6-7e19-0410-871a-916f4a2858ee

diff --git a/doc/postgis.xml b/doc/postgis.xml
index 22511f9a61a08345afb619f0b79e6be44f0210c3..71ed706a88857dd2a73441c09f48f6cdd9692f0e 100644 (file)
--- a/doc/postgis.xml
+++ b/doc/postgis.xml
@@ -177,8 +177,18 @@
                                                </listitem>
                                                <listitem>
                                                        <para>If want support for coordinate reprojection you must
-                                                         have the Proj4 library installed, and set the
-                                                         <varname>USE_PROJ</varname> variable to <emphasis>1</emphasis>.
+                                                         have the Proj4 library installed, set the
+                                                         <varname>USE_PROJ</varname> variable to <emphasis>1</emphasis>,
+                                                               and eventually adjust <varname>PROJ_DIR</varname> to point
+                                                               to your Proj4 installation directory.
+                                                       </para>
+                                               </listitem>
+                                               <listitem>
+                                                       <para>If want to use GEOS functionalities you must
+                                                         have the GEOS library installed, set the
+                                                         <varname>USE_GEOS</varname> variable to <emphasis>1</emphasis>,
+                                                               and eventually adjust <varname>GEOS_DIR</varname> to point to
+                                                               your GEOS installation directory.
                                                        </para>
                                                </listitem>
                                        </itemizedlist>
@@ -309,10 +319,19 @@
                                                </para>
                                        </listitem>
                                        <listitem>
-                                               <para>Also, if you want to be able to do coordinate
+                                               <para>If you want to be able to do coordinate
                                                  reprojections, you must install the Proj.4 library on your
-                                                 system, and set the <filename>USE_PROJ</filename> variable
-                                                 to 1 in the Makefile.
+                                                 system, set the <varname>USE_PROJ</varname> variable
+                                                 to 1 and the <varname>PROJ_DIR</varname> to your installation
+                                                       prefix in the Makefile.
+                                               </para>
+                                       </listitem>
+                                       <listitem>
+                                               <para>If you want to be able to use GEOS functions 
+                                                 you must install the GEOS library on your
+                                                 system, and set the <varname>USE_GEOS</varname> to 1
+                                                       and the <varname>GEOS_DIR</varname> to your installation
+                                                       prefix in the Makefile.
                                                </para>
                                        </listitem>
                                </orderedlist>