diff -up ClanLib-0.6.5/Sources/PNG/provider_png.cpp~ ClanLib-0.6.5/Sources/PNG/provider_png.cpp
--- ClanLib-0.6.5/Sources/PNG/provider_png.cpp~	2011-12-11 11:51:50.000000000 +0100
+++ ClanLib-0.6.5/Sources/PNG/provider_png.cpp	2011-12-11 12:03:31.622865327 +0100
@@ -544,7 +544,7 @@ void CL_PNGProvider::perform_lock()
 					(png_infopp)NULL);
 		cl_assert(false);
 	}   
-	if (setjmp(png_ptr->jmpbuf))
+	if (setjmp(png_jmpbuf(png_ptr)))
 	{
 		png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
 		cl_assert(false);