On , Louigi Verona &lt;louigi.verona@gmail.com&gt; wrote:<br />&gt; /home/louigi/Desktop/petri-foo-0.1.4/libphin/phinslider.c:802: error: ‘CAIRO_OPERATOR_HSL_LUMINOSITY’ undeclared (first use in this function)<br /><br />Shot in the dark: add at the top of phinslider.c<br />#include &lt;cairo/cairo.h&gt;<br /><br />-H