diff -ru qt-x11-free-3.3.8b-orig//src/kernel/qpngio.cpp qt-x11-free-3.3.8b/src/kernel/qpngio.cpp
--- qt-x11-free-3.3.8b-orig//src/kernel/qpngio.cpp	2008-01-15 14:09:13.000000000 -0500
+++ qt-x11-free-3.3.8b/src/kernel/qpngio.cpp	2010-05-13 01:22:17.295436061 -0400
@@ -162,7 +162,11 @@
 		image.setColor( i, qRgba(c,c,c,0xff) );
 	    }
 	    if ( png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS) ) {
+#if PNG_LIBPNG_VER < 10400
 		const int g = info_ptr->trans_values.gray;
+#else
+		const int g = info_ptr->trans_color.gray;
+#endif
 		if (g < ncols) {
 		    image.setAlphaBuffer(TRUE);
 		    image.setColor(g, image.color(g) & RGB_MASK);
@@ -190,7 +194,11 @@
 		    info_ptr->palette[i].red,
 		    info_ptr->palette[i].green,
 		    info_ptr->palette[i].blue,
+#if PNG_LIBPNG_VER < 10400
 		    info_ptr->trans[i]
+#else
+		    info_ptr->trans_alpha[i]
+#endif
 		    )
 		);
 		i++;