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diff -ru cairo-1.6.4/src/cairo-png.c cairo-1.6.4-mod/src/cairo-png.c
--- cairo-1.6.4/src/cairo-png.c 2008-04-11 17:07:25.000000000 -0400
+++ cairo-1.6.4-mod/src/cairo-png.c 2008-08-19 17:19:36.682399853 -0400
@@ -119,6 +119,14 @@
}
+/* Starting with libpng-1.2.30, we must explicitly specify an output_flush_fn.
+ * Otherwise, we will segfault if we are writing to a stream. */
+static void
+png_simple_output_flush_fn (png_structp png_ptr)
+{
+ return;
+}
+
static cairo_status_t
write_png (cairo_surface_t *surface,
png_rw_ptr write_func,
@@ -179,7 +187,7 @@
goto BAIL3;
#endif
- png_set_write_fn (png, closure, write_func, NULL);
+ png_set_write_fn (png, closure, write_func, png_simple_output_flush_fn);
switch (image->format) {
case CAIRO_FORMAT_ARGB32:
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