+<li><code>--enable-gl-osmesa</code> - The <a href="osmesa.html">OSMesa
+library</a> can be built on top of libGL for drivers that provide it.
+This option controls whether to build libOSMesa. By default, this is
+enabled for the Xlib driver and disabled otherwise. Note that this
+option is different than using OSMesa as the driver.
+</li>