core/com.nokia.carbide.cpp.doc.user/html/reference/build_properties/pane_build_config_env.htm
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<h2>Environment Variables</h2>
<p> The <b>Environment Variables </b> pane allows you to view the current User and System environment variables that will be used when any abld command is invoked. User variables are modified or added when a process is invoked. Read only system variables are listed. Variables and values in bold are items that have been modified from their default values.</p>
<p>Some variables have special meaning, including:</p>
<ul>
<li><span class="code">PATH</span> — will always place "<span class="code">${EPOCROOT}\epoc32\tools;${EPOCROOT}\epoc32\gcc\bin;</span>" at the front of the <span class="code">PATH</span> regardless of what it is changed to </li>
<li><span class="code">PATH</span>, <span class="code">EPOCROOT</span>, and <span class="code">*MW</span> variables — <span class="note">cannot be undefined as they are required for system builds</span></li>
</ul>
<p align="center"><img src="../images/page_build_config_env.png" width="558" height="456"></p>
<p class="figure">Figure 1 - Environment Variables</p>
<h5>Table 1 Environment variable items</h5>
<table width="100%" border="0" cellpadding="2" cellspacing="0">
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<th width="29%" scope="col">Item</th>
<th width="57%" scope="col">Explanation</th>
</tr>
<tr>
<td><b>New</b></td>
<td>Click to add a new environment variable. You must specify a name and a value. </td>
</tr>
<tr>
<td><b>Edit</b></td>
<td>Allows you to edit the name and value of an environment variable.</td>
</tr>
<tr>
<td><b>Undefine</b></td>
<td><p>Undefines the selected variable so that it is not used during a build.</p>
<p class="note"><b>NOTE</b> Some variables, like <span class="code">PATH</span>, <span class="code">EPOCROOT</span>, and those beginning with <span class="code">MW*</span> have special meaning and cannot be undefined. </p></td>
</tr>
<tr>
<td><b>Variable use</b></td>
<td><p>Shows the use for the selected variable. Uses include:</p>
<ul>
<li>Default – Take the variable as-is from the system, do not modify it.</li>
<li>Append – Add the value displayed to the end of the existing variable (the existing variable name is not displayed.</li>
<li>Prepend – Add the value displayed to the front of the existing variable (the existing variable name is not displayed.</li>
<li>Replace – Replace the value displayed with the existing variable.</li>
<li>Undefine – Not used during a build</li>
</ul></td>
</tr>
</table>
<h5>Other references </h5>
<ul>
<li><a href="pane_build_config.htm">Carbide Build Configurations</a></li>
<li><a href="pane_build_config.htm">SIS Builder</a></li>
<li><a href="pane_build_config_args.htm">Arguments</a></li>
<li><a href="pane_build_config_paths.htm">Paths and Symbols </a></li>
</ul>
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