title: CMAKE logical expressions combined "STREQUAL" and "OR"
body: <p>Please correct the usage of logical expressions</p>
  <pre><code>$&lt;$&lt;STREQUAL:${VARIANT},abc&gt;or&gt;$&lt;$&lt;STREQUAL:${VARIANT},xyz&gt;:service::accept_service&gt;
  </code></pre>
  <p>Here am trying to check if the variant is either &quot;abc&quot; or &quot;xyz&quot; based on that service::accept_service is enabled.
  There is a syntax mistake in combining STREQUAL and OR expressions which am not able to figure.</p>