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<section id="env">
<span id="variable:ENV"></span><h1>ENV<a class="headerlink" href="#env" title="Permalink to this heading">ΒΆ</a></h1>
<p>Operator to read environment variables.</p>
<p>Use the syntax <code class="docutils literal notranslate"><span class="pre">$ENV{VAR}</span></code> to read environment variable <code class="docutils literal notranslate"><span class="pre">VAR</span></code>.</p>
<p>To test whether an environment variable is defined, use the signature
<code class="docutils literal notranslate"><span class="pre">if(DEFINED</span> <span class="pre">ENV{<name>})</span></code> of the <span class="target" id="index-0-command:if"></span><a class="reference internal" href="../command/if.html#command:if" title="if"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">if()</span></code></a> command.</p>
<p>For general information on environment variables, see the
<a class="reference internal" href="../manual/cmake-language.7.html#cmake-language-environment-variables"><span class="std std-ref">Environment Variables</span></a>
section in the <span class="target" id="index-0-manual:cmake-language(7)"></span><a class="reference internal" href="../manual/cmake-language.7.html#manual:cmake-language(7)" title="cmake-language(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">cmake-language(7)</span></code></a> manual.</p>
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