-<p>The argument is a comma separated string. It is usually used to specify the
-rendering APIs, such as OpenVG, to build. But it is also used to specify
-<code>egl</code> state tracker that <code>egl_gallium</code> depends on.</p>
+<p>The available platforms are <code>x11</code>, <code>drm</code>,
+<code>wayland</code>, <code>surfaceless</code>, <code>android</code>,
+and <code>haiku</code>.
+The <code>android</code> platform can either be built as a system
+component, part of AOSP, using <code>Android.mk</code> files, or
+cross-compiled using appropriate <code>configure</code> options.
+The <code>haiku</code> platform can only be built with SCons.
+Unless for special needs, the build system should
+select the right platforms automatically.</p>