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Fix building with libpng-1.4.
--- emacs-21.4-orig/src/xfns.c
+++ emacs-21.4/src/xfns.c
@@ -8641,7 +8641,7 @@
/* Check PNG signature. */
if (fread (sig, 1, sizeof sig, fp) != sizeof sig
- || !png_check_sig (sig, sizeof sig))
+ || png_sig_cmp (sig, 0, sizeof sig))
{
image_error ("Not a PNG file: `%s'", file, Qnil);
UNGCPRO;
@@ -8658,7 +8658,7 @@
/* Check PNG signature. */
if (tbr.len < sizeof sig
- || !png_check_sig (tbr.bytes, sizeof sig))
+ || png_sig_cmp (tbr.bytes, 0, sizeof sig))
{
image_error ("Not a PNG image: `%s'", img->spec, Qnil);
UNGCPRO;
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