diff --git a/libpng16-0387-Reenable-code-to-allow-zero-length-PLTE-chunks-for-M.patch b/libpng16-0387-Reenable-code-to-allow-zero-length-PLTE-chunks-for-M.patch
new file mode 100644
index 0000000..318826c
--- /dev/null
+++ b/libpng16-0387-Reenable-code-to-allow-zero-length-PLTE-chunks-for-M.patch
@@ -0,0 +1,57 @@
+http://sourceforge.net/mailarchive/forum.php?thread_name=20130219075910.GK27522%40danbala.tuwien.ac.at&forum_name=png-mng-implement
+
+From 9ee585718b346d32767015152a728106922b49d1 Mon Sep 17 00:00:00 2001
+Message-Id: <9ee585718b346d32767015152a728106922b49d1.1361241956.git.jbowler@acm.org>
+From: John Bowler <jbowler@acm.org>
+Date: Mon, 18 Feb 2013 18:44:14 -0800
+Subject: [libpng16] Reenable code to allow zero length PLTE chunks for MNG
+ support.
+
+Signed-off-by: John Bowler <jbowler@acm.org>
+---
+ pngset.c | 16 ++++++++++++++--
+ 1 file changed, 14 insertions(+), 2 deletions(-)
+
+diff --git a/pngset.c b/pngset.c
+index ac39a44..f89861e 100644
+--- a/pngset.c
++++ b/pngset.c
+@@ -514,7 +514,7 @@ png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
+ 
+    png_debug1(1, "in %s storage function", "PLTE");
+ 
+-   if (png_ptr == NULL || info_ptr == NULL || palette == NULL)
++   if (png_ptr == NULL || info_ptr == NULL)
+       return;
+ 
+    if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
+@@ -529,6 +529,17 @@ png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
+       }
+    }
+ 
++   if ((num_palette > 0 && palette == NULL) ||
++      (num_palette == 0
++#        ifdef PNG_MNG_FEATURES_SUPPORTED
++            && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
++#        endif
++      ))
++   {
++      png_chunk_report(png_ptr, "Invalid palette", PNG_CHUNK_ERROR);
++      return;
++   }
++
+    /* It may not actually be necessary to set png_ptr->palette here;
+     * we do it for backward compatibility with the way the png_handle_tRNS
+     * function used to do the allocation.
+@@ -545,7 +556,8 @@ png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
+    png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
+        PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
+ 
+-   memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color)));
++   if (num_palette > 0)
++      memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color)));
+    info_ptr->palette = png_ptr->palette;
+    info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
+ 
+-- 
+1.8.1.2
diff --git a/libpng16.changes b/libpng16.changes
index a30ff9d..eefae11 100644
--- a/libpng16.changes
+++ b/libpng16.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Mar 18 11:44:21 UTC 2013 - pgajdos@suse.com
+
+- allow zero length PLTE chunks
+  (fixes GraphicsMagick testsuite)
+
 -------------------------------------------------------------------
 Mon Mar  4 07:50:46 UTC 2013 - pgajdos@suse.com
 
diff --git a/libpng16.spec b/libpng16.spec
index 025c8b2..74a158a 100644
--- a/libpng16.spec
+++ b/libpng16.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package libpng16
 #
-# Copyright (c) 2012 SUSE LINUX Products GmbH, Nuernberg, Germany.
+# Copyright (c) 2013 SUSE LINUX Products GmbH, Nuernberg, Germany.
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -32,6 +32,8 @@ License:        Zlib
 Group:          System/Libraries
 Source:         libpng-%{version}.tar.bz2
 Source2:        baselibs.conf
+# will be upstreamed in 1.6.1
+Patch0:         libpng16-0387-Reenable-code-to-allow-zero-length-PLTE-chunks-for-M.patch
 BuildRequires:  libtool
 BuildRequires:  pkg-config
 BuildRequires:  zlib-devel
@@ -53,7 +55,10 @@ Provides:       libpng = %{version}-%{release}
 %package devel
 Summary:        Development Tools for applications which will use the Libpng
 Group:          Development/Libraries/C and C++
-Requires:       zlib-devel glibc-devel %{libname} = %{version} pkg-config
+Requires:       %{libname} = %{version}
+Requires:       glibc-devel
+Requires:       pkg-config
+Requires:       zlib-devel
 Recommends:     libpng%{branch}-compat-devel
 # bug437293
 %ifarch ppc64
@@ -93,6 +98,7 @@ about libpng version.
 
 %prep
 %setup -n libpng-%{version}
+%patch0 -p1
 
 %build
 # We'll never use the old pgcc-2.95.1 with the buggy -O3, so having