</span>BOOST_PROTO_DEFINE_ENV_VAR(Type, Name)</pre></div>
<div class="refsect1">
-<a name="idp569579792"></a><h2>Description</h2>
+<a name="idp481900976"></a><h2>Description</h2>
<p>
Proto primitive transforms can optionally accept an environment in
their third parameter which is a key/value store of environment