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--- ./src/extra/gd/gd_png.c.orig 2005-07-27 15:35:06.000000000 -0500
+++ ./src/extra/gd/gd_png.c 2010-02-14 18:24:19.000000000 -0600
@@ -136,7 +136,7 @@
/* first do a quick check that the file really is a PNG image; could
* have used slightly more general png_sig_cmp() function instead */
gdGetBuf (sig, 8, infile);
- if (!png_check_sig (sig, 8))
+ if (!(png_sig_cmp(sig, 0, 8) == 0))
return NULL; /* bad signature */
#ifndef PNG_SETJMP_NOT_SUPPORTED
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