--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-2910AB26-CA7C-50B9-A187-0C8406C1ED1F.dita	Thu Jan 21 18:18:20 2010 +0000
@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-2910AB26-CA7C-50B9-A187-0C8406C1ED1F" xml:lang="en"><title>prj_extensions</title><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p> <codeph>prj_extensions</codeph>  </p>
+<p> <codeph>start extension</codeph>  <varname>subsystem\ext-template</varname>  </p>
+<p>[<codeph>target</codeph>  <varname>target_file_name</varname>] </p>
+<p>[<codeph>sources</codeph>  <varname>source_file_1 ... source_file_n</varname>] </p>
+<p>[<codeph>dependencies</codeph>  <varname>dependency_file_1 ...        
+dependency_file_n</varname>] </p>
+<p>[<codeph>tool</codeph>  <varname>toolname</varname>] </p>
+<p>[<codeph>option</codeph>  <varname>key_1</varname> <varname>value_1</varname>] </p>
+<p>... </p>
+<p>[<codeph>option</codeph>  <varname>key_n</varname> <varname>value_n</varname>] </p>
+<p> <codeph>end</codeph>  </p>
+<p> <b>Note:</b> The value argument in the option statement is optional. </p>
+<p>The <codeph>prj_extensions</codeph> section lists all the template extension
+makefiles that are to be invoked while building the component. This approach
+is introduced since Symbian OS v9.3 and it deprecates the use of <codeph>makefile</codeph> and <codeph>gnumakefile</codeph> directives
+in <filepath>bld.inf</filepath> files. It is recommend to use <codeph>prj_extensions</codeph> approach
+to call the extension makefile templates. </p>
+<p> <i>Note that a prj_extensions section can have one or more of start extension
+... end blocks.</i>  </p>
+<p> <varname>subsystem/ext-template</varname> specifies the extension makefile
+template name along with its path relative to the <codeph>epoc32</codeph> template
+directory, which is <filepath>\epoc32\tools\makefile_templates\</filepath>.
+The <codeph>.mk</codeph> suffix of the template need not be specified, as
+it is handled automatically. </p>
+<p>The optional <codeph>target</codeph>  <varname>target_file_name</varname> specifies
+the name and location of the target to be built. </p>
+<p>The optional <codeph>sources</codeph>  <varname>source_file_1 ....    
+    source_file_n</varname> specifies the list of source file names along
+with their path, which are required to build the <codeph>target</codeph>. </p>
+<p>The optional <codeph>dependencies</codeph>  <varname>dependency_file_1
+...         dependency_file_n</varname> specifies the list of dependency file
+names along with their path, which are required to build the <codeph>target</codeph>.
+The file extension part of the name need not be specified, as this will be
+automatically supplied. </p>
+<p>The optional <codeph>tool</codeph>  <varname>toolname</varname> specifies
+the tool to be used to build the target. </p>
+<p>The optional <codeph>option</codeph>  <varname>key_1</varname> <varname>value_1</varname> specifies
+the parameter values for the template extension makefile, as key-value pairs.
+These parameters are variables used in the template, and the precise set of
+variables specified here are entirely dependent on the requirement. There
+is no limit to the number of parameters a template extension makefile may
+require and can take. </p>
+<example><p>This example sets <codeph>PREFIX</codeph>, <codeph>HALPATH</codeph> and <codeph>SOURCE</codeph> options
+of the template extension makefile <filepath>config.mk</filepath></p><codeblock id="GUID-E876D415-D71A-51B9-BAF7-4ABE5335947E" xml:space="preserve">PRJ_EXTENSIONS
+start        extension        base\config
+
+option         PREFIX         _SH2_
+option         HALPATH        \..\..\..
+option            SOURCE            \..\hal
+
+end
+</codeblock></example>
+</conbody></concept>
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