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      <base href="https://bugs.webkit.org/" />

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        <tr>

          <th>Bug ID</th>

          <td><a class="bz_bug_link 

          bz_status_NEW "

   title="NEW - include proper header to use inline function isMainFrame"

   href="https://bugs.webkit.org/show_bug.cgi?id=152342">152342</a>

          </td>

        </tr>

        <tr>

          <th>Summary</th>

          <td>include proper header to use inline function isMainFrame

          </td>

        </tr>

        <tr>

          <th>Classification</th>

          <td>Unclassified

          </td>

        </tr>

        <tr>

          <th>Product</th>

          <td>WebKit

          </td>

        </tr>

        <tr>

          <th>Version</th>

          <td>WebKit Nightly Build

          </td>

        </tr>

        <tr>

          <th>Hardware</th>

          <td>Unspecified

          </td>

        </tr>

        <tr>

          <th>OS</th>

          <td>Unspecified

          </td>

        </tr>

        <tr>

          <th>Status</th>

          <td>NEW

          </td>

        </tr>

        <tr>

          <th>Severity</th>

          <td>Normal

          </td>

        </tr>

        <tr>

          <th>Priority</th>

          <td>P2

          </td>

        </tr>

        <tr>

          <th>Component</th>

          <td>WebCore Misc.

          </td>

        </tr>

        <tr>

          <th>Assignee</th>

          <td>webkit-unassigned&#64;lists.webkit.org

          </td>

        </tr>

        <tr>

          <th>Reporter</th>

          <td>honglh&#64;gmail.com

          </td>

        </tr></table>

      <p>

        <div>

        <pre>When I am building webcore in debug mode, the build failed 

../../lib/libWPEWebKit.so.0.0.1: error: undefined reference to 'WebCore::Frame::isMainFrame() const'

The issue may be introduced by <a class="bz_bug_link 

          bz_status_RESOLVED  bz_closed"

   title="RESOLVED FIXED - Print out the render tree from command line."

   href="show_bug.cgi?id=150416">https://bugs.webkit.org/show_bug.cgi?id=150416</a>

Since Frame::isMainFrame() is inline function defined in MainFrame.h,

The change from 150416 introduced in DEBUG mode a reference to isMainFrame without using #include &quot;MainFrame.h&quot;

Adding the following lines in Source/WebCore /rendering/RenderObject.cpp 

resolved the build failure.

diff --git a/Source/WebCore/rendering/RenderObject.cpp b/Source/WebCore/rendering/RenderObject.cpp

index 8b74a66..5365daa 100644

--- a/Source/WebCore/rendering/RenderObject.cpp

+++ b/Source/WebCore/rendering/RenderObject.cpp

&#64;&#64; -72,6 +72,9 &#64;&#64;

 #include &lt;algorithm&gt;

 #include &lt;stdio.h&gt;

 #include &lt;wtf/RefCountedLeakCounter.h&gt;

+#ifndef NDEBUG

+#include &quot;MainFrame.h&quot;

+#endif</pre>

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