<p></p>
<p>Thanks elextr.  I did not build Geany or plugins with any special --prefix option.  I just used defaults.  Here are the exact steps I used to build both geany and plugins (I savied them from terminal scrollback):</p>
<pre><code>sudo apt remove geany-common
git clone https://github.com/geany/geany.git
git clone https://github.com/geany/geany-plugins.git
cd geany
pip install rst2html
sudo apt-get install intltool
./autogen.sh
sudo make
sudo make install

cd ../geany-plugins
sudo apt install libvte-2.91-dev
./autogen.sh --enable-debugger
make
sudo make install
</code></pre>
<p>Based on your description, I was able to fix my problem by adding a file <code>/etc/ld.so.conf.d/local.conf</code> which contains a single line that points to <code>/usr/local/lib</code>, then running <code>sudo ldconfig</code>.  After that, Geany shows the Debugger plugin in the Plugin Manager.  Yay!</p>
<p>Is there a build step that I should have done differently?</p>

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