config/#packageconfig">Instance Config Reference →
<code>PackageConfig</code></a>. The map is keyed by
package name (from the <code>Packages</code> field), and each map entry can have the
following fields:</p>
<ul>
<li><code>CommandLineFlags</code> for <a href="#flags">Command-line flags</a></li>
<li><code>Environment</code> for <a href="#env">Environment variables</a></li>
<li><code>GoBuildFlags</code> for <a href="#buildflags">Go build flags</a></li>
<li><code>ExtraFilePaths</code> or <code>ExtraFileCon