Fix compiler warning with gluTessCallback

diff --git a/src/objects/grits-poly.c b/src/objects/grits-poly.c
index 865d2887f1ebafd79d08aa353a28d488698ca9ec..67e39e5acacd3d2b314e0183d8ffb3795c824d0f 100644 (file)
--- a/src/objects/grits-poly.c
+++ b/src/objects/grits-poly.c
@@ -34,9 +34,9 @@ static void grits_poly_tess(gdouble (**points)[3])
 
        /* Tesselate */
        GLUtesselator *tess = gluNewTess();
-       gluTessCallback(tess, GLU_TESS_BEGIN,  glBegin);
-       gluTessCallback(tess, GLU_TESS_VERTEX, glVertex3dv);
-       gluTessCallback(tess, GLU_TESS_END,    glEnd);
+       gluTessCallback(tess, GLU_TESS_BEGIN,  (_GLUfuncptr)glBegin);
+       gluTessCallback(tess, GLU_TESS_VERTEX, (_GLUfuncptr)glVertex3dv);
+       gluTessCallback(tess, GLU_TESS_END,    (_GLUfuncptr)glEnd);
        gluTessBeginPolygon(tess, NULL);
        for (int pi = 0; points[pi]; pi++) {
                gluTessBeginContour(tess);