pan class="keywordtype">int</span> error, <span class="keyword">const</span> <span class="keywordtype">char</span>* description)</div>
<div class="line">{</div>
<div class="line">    fputs(description, stderr);</div>
<div class="line">}</div>
</div><!-- fragment --><p>Callback functions must be set, so GLFW knows to call them. The function to set the error callback is one of the few GLFW functions that may be called before initialization, which lets you be notified of errors both during and after initializa