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      <base href="https://bugs.webkit.org/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Build fails for X11+EGL due to missing gst_gl_display_x11_new_with_display()"
   href="https://bugs.webkit.org/show_bug.cgi?id=162606">162606</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Build fails for X11+EGL due to missing gst_gl_display_x11_new_with_display()
          </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>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </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>mario&#64;webkit.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>magomez&#64;igalia.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>In MediaPlayerPrivateGStreamerBase::ensureGstGLContext() [1] a call to either gst_gl_display_x11_new_with_display() or gst_gl_display_egl_new_with_egl_display() is made depending on whether we're building for X11 or Wayland:
  [...]
  #if PLATFORM(X11)
          m_glDisplay = GST_GL_DISPLAY(gst_gl_display_x11_new_with_display(downcast&lt;PlatformDisplayX11&gt;(sharedDisplay).native()));
  #elif PLATFORM(WAYLAND)
          m_glDisplay = GST_GL_DISPLAY(gst_gl_display_egl_new_with_egl_display(downcast&lt;PlatformDisplayWayland&gt;(sharedDisplay).native()));
  #endif
  [...]

However, this will fail when building for X11 with EGL (instead of GLX), since gst_gl_display_x11_new_with_display() is defined in /usr/include/gst/gl/x11/gstgldisplay_x11.h, which doesn't get included for EGL:

  [...]
  #include &quot;GLContext.h&quot;
  #if USE(GLX)
  #include &quot;GLContextGLX.h&quot;
  #include &lt;gst/gl/x11/gstgldisplay_x11.h&gt;
  #elif USE(EGL)
  #include &quot;GLContextEGL.h&quot;
  #include &lt;gst/gl/egl/gstgldisplay_egl.h&gt;
  #endif
  [...]

I believe a simple fix is to change the condition there to check for GLX or EGL, instead of X11 or WAYLAND.

[1] <a href="https://svn.webkit.org/repository/webkit/trunk/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp">https://svn.webkit.org/repository/webkit/trunk/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp</a></pre>
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