<p>lex.yy.c is generated without a include for unistd.h, which defines isatty.</p>

<pre><code>Compiling lex.yy.c
lex.yy.c: In function ‘yy_init_buffer’:
lex.yy.c:4154:9: warning: implicit declaration of function ‘isatty’ [-Wimplicit-function-declaration]
         b-&gt;yy_is_interactive = file ? (isatty( fileno(file) ) &gt; 0) : 0;
         ^
</code></pre>

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