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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - configure --enable-udev --disable-oss-output --disable-alsa outputs bogus '*** UDEV support not found'"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=89213">89213</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>configure --enable-udev --disable-oss-output --disable-alsa outputs bogus '*** UDEV support not found'
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>PulseAudio
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>build-system
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>pulseaudio-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>mgorny@gentoo.org
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>pulseaudio-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>lennart@poettering.net
          </td>
        </tr></table>
      <p>
        <div>
        <pre>AS_IF([test "x$enable_udev" != "xno" -a \( "x$HAVE_OSS" = "x1" -o "x$HAVE_ALSA"
= "x1" \)],
    [PKG_CHECK_MODULES(UDEV, [ libudev >= 143 ], HAVE_UDEV=1, HAVE_UDEV=0)],
    HAVE_UDEV=0)

AS_IF([test "x$enable_udev" = "xyes" && test "x$HAVE_UDEV" = "x0"],
    [AC_MSG_ERROR([*** UDEV support not found])])


This means that if both OSS & ALSA are disabled, udev check is never run. Then
having udev enabled results in bogus '*** UDEV support not found' message.

Instead, it should probably output something along the lines '*** UDEV support
requires --enable-alsa or --enable-oss-output'.

Original bug report: <a href="https://bugs.funtoo.org/browse/FL-2108">https://bugs.funtoo.org/browse/FL-2108</a></pre>
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