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  <section id="unset">
<span id="command:unset"></span><h1>unset<a class="headerlink" href="#unset" title="Permalink to this heading">¶</a></h1>
<p>Unset a variable, cache variable, or environment variable.</p>
<section id="unset-normal-variable-or-cache-entry">
<h2>Unset Normal Variable or Cache Entry<a class="headerlink" href="#unset-normal-variable-or-cache-entry" title="Permalink to this heading">¶</a></h2>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">unset(</span><span class="nv">&lt;variable&gt;</span><span class="w"> </span><span class="p">[</span><span class="no">CACHE</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="no">PARENT_SCOPE</span><span class="p">]</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>Removes a normal variable from the current scope, causing it
to become undefined.  If <code class="docutils literal notranslate"><span class="pre">CACHE</span></code> is present, then a cache variable
is removed instead of a normal variable.  Note that when evaluating
<a class="reference internal" href="../manual/cmake-language.7.html#variable-references"><span class="std std-ref">Variable References</span></a> of the form <code class="docutils literal notranslate"><span class="pre">${VAR}</span></code>, CMake first searches
for a normal variable with that name.  If no such normal variable exists,
CMake will then search for a cache entry with that name.  Because of this
unsetting a normal variable can expose a cache variable that was previously
hidden.  To force a variable reference of the form <code class="docutils literal notranslate"><span class="pre">${VAR}</span></code> to return an
empty string, use <code class="docutils literal notranslate"><span class="pre">set(&lt;variable&gt;</span> <span class="pre">&quot;&quot;)</span></code>, which clears the normal variable
but leaves it defined.</p>
<p>If <code class="docutils literal notranslate"><span class="pre">PARENT_SCOPE</span></code> is present then the variable is removed from the scope
above the current scope.  See the same option in the <span class="target" id="index-0-command:set"></span><a class="reference internal" href="set.html#command:set" title="set"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">set()</span></code></a> command
for further details.</p>
</section>
<section id="unset-environment-variable">
<h2>Unset Environment Variable<a class="headerlink" href="#unset-environment-variable" title="Permalink to this heading">¶</a></h2>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">unset(</span><span class="o">ENV{</span><span class="nt">&lt;variable&gt;</span><span class="o">}</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>Removes <code class="docutils literal notranslate"><span class="pre">&lt;variable&gt;</span></code> from the currently available
<span class="target" id="index-0-manual:cmake-env-variables(7)"></span><a class="reference internal" href="../manual/cmake-env-variables.7.html#manual:cmake-env-variables(7)" title="cmake-env-variables(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">Environment</span> <span class="pre">Variables</span></code></a>.
Subsequent calls of <code class="docutils literal notranslate"><span class="pre">$ENV{&lt;variable&gt;}</span></code> will return the empty string.</p>
<p>This command affects only the current CMake process, not the process
from which CMake was called, nor the system environment at large,
nor the environment of subsequent build or test processes.</p>
</section>
<section id="see-also">
<h2>See Also<a class="headerlink" href="#see-also" title="Permalink to this heading">¶</a></h2>
<ul class="simple">
<li><p><span class="target" id="index-1-command:set"></span><a class="reference internal" href="set.html#command:set" title="set"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">set()</span></code></a></p></li>
</ul>
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<li><a class="reference internal" href="#">unset</a><ul>
<li><a class="reference internal" href="#unset-normal-variable-or-cache-entry">Unset Normal Variable or Cache Entry</a></li>
<li><a class="reference internal" href="#unset-environment-variable">Unset Environment Variable</a></li>
<li><a class="reference internal" href="#see-also">See Also</a></li>
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