<div dir="ltr"><div>OK thanks, exactly the general guidance I was looking for. I'll look into upgrading. Is there currently a version that makes things easiest?</div><div><br></div><div><br> </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jun 19, 2023 at 2:34 PM Even Rouault <<a href="mailto:even.rouault@spatialys.com">even.rouault@spatialys.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Building recent QGIS versions on 20.04 is going to be quite a lot
of pain since you'll need indeed to have a qt 5.15 build, and all
the other auxiliary QT based dependencies build against it.<br>
</p>
<p>I'd suggest you update to 22.04 at least. Or if you don't want to
do development but can live with released versions, try
conda-forge builds (cf <a href="https://plugins.qgis.org/planet/tag/conda/" target="_blank">https://plugins.qgis.org/planet/tag/conda/</a>)<br>
</p>
<div>Le 19/06/2023 à 20:30, Hugh Kelley via
QGIS-Developer a écrit :<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Hi all,</div>
<div><br>
</div>
<div>while working on compiling qgis on ubuntu using these
instructions [0] , i've run into an error while running cmake
that "QRecursiveMutex" is not found. <br>
</div>
<div><br>
</div>
<div>It looks like that became available in QT 5.14. <br>
</div>
<div><br>
</div>
<div>Ubuntu 20.04 installs QT 5.12. During my searches i've seen
comments that imply 5.15 might not be available for 20.04.
I'm trying to figure out whether I should be trying to upgrade
Qt, if I have to upgrade Ubuntu, or if there is some option in
the compilation process that can resolve this for me. <br>
</div>
<div><br>
</div>
<div>I've installed Qt 5.15.2 to /opt/ and added it to PATH, but
qtdiag still indicates i'm using 5.12.x<br>
</div>
<div><br>
</div>
<div>I thought i'd start by asking here before asking on a Qt
general forum in case there's a qgis specific solution.</div>
<div><br>
</div>
<div>I've also set the cmake 3d option to "no" which got me
around the absence of q qt 3d extras pacakge/file. So maybe
there's a similar solution for this although this version
problem seem more essential. <br>
</div>
<div><br>
</div>
<div>Thanks for any suggestions!<br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>[0] <a href="https://github.com/qgis/QGIS/blob/master/INSTALL.md" target="_blank">https://github.com/qgis/QGIS/blob/master/INSTALL.md</a></div>
<br>
<span class="gmail_signature_prefix">-- </span><br>
<div dir="ltr" class="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr">Hugh Kelley <br>
<div><br>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset></fieldset>
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My software is free, but my time generally not.</pre>
</div>
</blockquote></div><br clear="all"><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr">Hugh Kelley <br><div><br></div></div></div></div></div></div></div></div>