From fe1e686ad56222fc19975654da27839b6607d9ad Mon Sep 17 00:00:00 2001
From: Christian Henning <chhenning@gmail.com>
Date: Tue, 9 Jul 2013 13:50:24 +0000
Subject: [PATCH] Set compiler symbol indicating an older libpng version.

[SVN r84990]
---
 include/boost/gil/extension/io/png_tags.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/boost/gil/extension/io/png_tags.hpp b/include/boost/gil/extension/io/png_tags.hpp
index 2b003b67b..d6eac99d3 100644
--- a/include/boost/gil/extension/io/png_tags.hpp
+++ b/include/boost/gil/extension/io/png_tags.hpp
@@ -41,6 +41,11 @@
     }
 #endif
 
+#if PNG_LIBPNG_VER_MAJOR == 1
+#if PNG_LIBPNG_VER_MINOR <= 4
+#define BOOST_GIL_IO_PNG_1_4_OR_LOWER
+#endif // PNG_LIBPNG_VER_MAJOR == 1
+#endif // PNG_LIBPNG_VER_MINOR <= 4
 
 #include <string>
 #include <vector>