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--- a/pngpriv.h
+++ a/pngpriv.h
@@ -938,24 +938,6 @@
#include "pngstruct.h"
#include "pnginfo.h"
-/* Validate the include paths - the include path used to generate pnglibconf.h
- * must match that used in the build, or we must be using pnglibconf.h.prebuilt:
- */
-#if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM
-# error ZLIB_VERNUM != PNG_ZLIB_VERNUM \
- "-I (include path) error: see the notes in pngpriv.h"
- /* This means that when pnglibconf.h was built the copy of zlib.h that it
- * used is not the same as the one being used here. Because the build of
- * libpng makes decisions to use inflateInit2 and inflateReset2 based on the
- * zlib version number and because this affects handling of certain broken
- * PNG files the -I directives must match.
- *
- * The most likely explanation is that you passed a -I in CFLAGS. This will
- * not work; all the preprocessor directives and in particular all the -I
- * directives must be in CPPFLAGS.
- */
-#endif
-
/* This is used for 16-bit gamma tables -- only the top level pointers are
* const; this could be changed:
*/
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