From a117d4eacc38289ad534acb07439a0e9e33f3dba Mon Sep 17 00:00:00 2001
From: Glenn Randers-Pehrson <glennrp at users.sourceforge.net>
Date: Wed, 18 Feb 2015 12:59:28 -0600
Subject: [PATCH] [libpng15] Allow calling png_get_IHDR() with NULL arguments
 (Reuben Hawkins).

---
 pngset.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pngset.c b/pngset.c
index 4886d8d30..3efc085ae 100644
--- a/pngset.c
+++ b/pngset.c
@@ -1237,6 +1237,7 @@ png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
 }
 #endif
 
+#ifdef PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED
 void PNGAPI
 png_set_compression_buffer_size(png_structp png_ptr, png_size_t size)
 {
@@ -1264,6 +1265,7 @@ png_set_compression_buffer_size(png_structp png_ptr, png_size_t size)
     png_ptr->zstream.avail_out = 0;
     png_ptr->zstream.avail_in = 0;
 }
+#endif /* WRITE_CUSTOMIZE_COMPRESSION */
 
 void PNGAPI
 png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)