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<title>EAGLE Help: #require</title>
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<i>EAGLE Help</i>
<h1><center>#require</center></h1>
<hr>
Over time it may happen that newer versions of EAGLE implement new or modified
User Language features, which can cause error messages when such a ULP is run
from an older version of EAGLE. In order to give the user a dedicated message
that this ULP requires at least a certain version of EAGLE, a ULP can contain
the <tt>#require</tt> directive. The syntax is
<pre>
#require <i>version</i>
</pre>
The <i>version</i> must be given as a <a href=143.htm>real constant</a>
of the form
<pre>
V.RRrr
</pre>
where <tt>V</tt> is the version number, <tt>RR</tt> is the release number
and <tt>rr</tt> is the (optional) revision number. For example, if a ULP
requires at least EAGLE version 4.11r06 (which is the beta version that first
implemented the <tt>#require</tt> directive), it could use
<pre>
#require 4.1106
</pre>
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