<p></p>
<h3 dir="auto">Description</h3>
<p dir="auto">Currently, an undefined environmental variable with <code>#!defenv</code> results in Kamailio failing to start.  The proposal  here that if the environmental variable is not defined, then the macro value would be undefined as well.  For example:</p>
<pre><code>!#KAMAILIO
loadmodule "xlog"
loadmodule "pv"

#!defenv FOO

request_route {
    #!ifdef FOO
        xlog("L_INFO","Environmental variable $$FOO is set\n");
    #!else
        xlog("L_WARN","Environmental variable $$FOO is NOT set\n");
    #!endif
    forward();
}
</code></pre>
<p dir="auto">Currently this configuration will fail to load if environmental variable is not set.  My proposal is to either allow <code>#!envdef</code> to accept an undefined environmental variable and have the preprocessor macro undefined, or to add a new keyword (<code>#!envdefn</code> perhaps?) to allow this behavior.</p>

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