From 3ffeff7877598d3236cc09a6d3f478073eb33f35 Mon Sep 17 00:00:00 2001
From: maccy2 <36641138+maccy2@users.noreply.github.com>
Date: Mon, 19 Feb 2018 18:21:26 +0100
Subject: [PATCH] Fix: 'inflateValidate' is only available on macOS 10.13 or
 newer

The warning occurs when compiling the latest wxWidgets 3.1.1 on macOS
and will cause the final application code to crash if run on macOS <
10.13. The patch fixes the issue, following this one:
https://git.libreofficechina.org/libreoffice/core/src/8d2a287da3abb0576512406227d0a3acd602123e/external/libpng/libpng-osx.patch.1

See https://github.com/wxWidgets/libpng/pull/1
---
 pngrutil.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pngrutil.c b/pngrutil.c
index d5fa08c39..356e8f1f2 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -423,7 +423,8 @@ png_inflate_claim(png_structrp png_ptr, png_uint_32 owner)
       }
 
 #if ZLIB_VERNUM >= 0x1290 && \
-   defined(PNG_SET_OPTION_SUPPORTED) && defined(PNG_IGNORE_ADLER32)
+   defined(PNG_SET_OPTION_SUPPORTED) && defined(PNG_IGNORE_ADLER32) && \
+   !(defined(MAC_OS_X_VERSION_MIN_REQUIRED) && MAC_OS_X_VERSION_MIN_REQUIRED < 101300)
       if (((png_ptr->options >> PNG_IGNORE_ADLER32) & 3) == PNG_OPTION_ON)
          /* Turn off validation of the ADLER32 checksum in IDAT chunks */
          ret = inflateValidate(&png_ptr->zstream, 0);