<p>In <a href="https://github.com/geany/geany-plugins/pull/324#discussion_r49270860">build/lineoperations.m4</a>:</p>
<pre style='color:#555'>> @@ -0,0 +1,10 @@
> +AC_DEFUN([GP_CHECK_LINEOPERATIONS],
> +[
> +    GP_ARG_DISABLE([LineOperations], [auto])
> +    GP_CHECK_PLUGIN_GTK2_ONLY([LineOperations])
</pre>
<p>Unless you know why you wouldn't want to support GTK3, you should remove this and try.  Actually, as I read your code nothing should stop you from supporting both GTK2 and GTK3 without a change.<br>
So i'd suggest to drop this GTK2 enforcement</p>

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