Add notes about dependency requirements for ST_AsMVT

Patch by Björn Harrtell <bjorn@wololo.org>

git-svn-id: http://svn.osgeo.org/postgis/trunk@15308 b70326c6-7e19-0410-871a-916f4a2858ee

diff --git a/doc/installation.xml b/doc/installation.xml
index 85175121573627df5e5f1eda63500a4fb9a5bc87..8b8c812e0a3966ac984f4f4cad032d99fa8636bd 100644 (file)
--- a/doc/installation.xml
+++ b/doc/installation.xml
@@ -206,6 +206,14 @@ psql -d yourdatabase -f sfcgal_comments.sql
                        </para>
                </listitem>
 
+               <listitem>
+                       <para>
+                         To enable ST_AsMVT protobuf-c library (for usage) and the protoc-c compiler (for building) are required.
+                               Also, pgk-config is required to verify the correct minimum version of protobuf-c.
+                               See <ulink url="https://github.com/protobuf-c/protobuf-c">protobuf-c</ulink>.
+                       </para>
+               </listitem>
+
          <listitem>
                <para>
                 CUnit (<filename>CUnit</filename>). This is needed for regression testing. <ulink url="http://cunit.sourceforge.net/">http://cunit.sourceforge.net/</ulink>