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<p>LWIP_PROVIDE_ERRNO==1: Let lwIP provide ERRNO values and the 'errno' variable. If this is disabled, cc.h must either define 'errno', include &lt;errno.h&gt;, define LWIP_ERRNO_STDINCLUDE to get &lt;errno.h&gt; included or define LWIP_ERRNO_INCLUDE to &lt;errno.h&gt; or equivalent. </p>

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