From 40a6c3c17272c8e4b45f14176898e269801be968 Mon Sep 17 00:00:00 2001
From: David Stoup <david.stoup@kitware.com>
Date: Fri, 10 Jul 2020 16:36:04 -0400
Subject: [PATCH] Update PNG to version 1.6.37

---
 CMake/External_PNG.cmake    |  6 +++---
 CMake/fletch-tarballs.cmake | 13 +++----------
 2 files changed, 6 insertions(+), 13 deletions(-)

diff --git a/CMake/External_PNG.cmake b/CMake/External_PNG.cmake
index c63aaa22..65004cf4 100644
--- a/CMake/External_PNG.cmake
+++ b/CMake/External_PNG.cmake
@@ -23,9 +23,9 @@ ExternalProject_Add(PNG
   URL_MD5 ${PNG_md5}
   ${COMMON_EP_ARGS}
   ${COMMON_CMAKE_EP_ARGS}
-  PATCH_COMMAND ${CMAKE_COMMAND} -E copy
-    ${fletch_SOURCE_DIR}/Patches/PNG/CMakeLists.txt
-    ${fletch_BUILD_PREFIX}/src/PNG/CMakeLists.txt
+#  PATCH_COMMAND ${CMAKE_COMMAND} -E copy
+#    ${fletch_SOURCE_DIR}/Patches/PNG/CMakeLists.txt
+#    ${fletch_BUILD_PREFIX}/src/PNG/CMakeLists.txt
   CMAKE_ARGS
     ${COMMON_CMAKE_ARGS}
     ${png_cmake_args}
diff --git a/CMake/fletch-tarballs.cmake b/CMake/fletch-tarballs.cmake
index 7fb21f57..b9aea1ec 100644
--- a/CMake/fletch-tarballs.cmake
+++ b/CMake/fletch-tarballs.cmake
@@ -63,17 +63,10 @@ list(APPEND fletch_external_sources libtiff)
 # PNG
 set(PNG_version_major 1)
 set(PNG_version_minor 6)
-set(PNG_version_patch 19)
+set(PNG_version_patch 37)
 set(PNG_version "${PNG_version_major}.${PNG_version_minor}.${PNG_version_patch}")
-set(PNG_major_minor_no_dot "${PNG_version_major}${PNG_version_minor}")
-set(PNG_version_no_dot "${PNG_major_minor_no_dot}${PNG_version_patch}")
-if(WIN32)
-  set(PNG_url "http://sourceforge.net/projects/libpng/files/libpng${PNG_major_minor_no_dot}/older-releases/${PNG_version}/lpng${PNG_major_minor_no_dot}${PNG_version_patch}.zip")
-  set(PNG_md5 "ff0e82b4d8516daa7ed6b1bf93acca48")
-else()
-  set(PNG_url "http://sourceforge.net/projects/libpng/files/libpng${PNG_major_minor_no_dot}/older-releases/${PNG_version}/libpng-${PNG_version}.tar.gz")
-  set(PNG_md5 "3121bdc77c365a87e054b9f859f421fe")
-endif()
+set(PNG_url "https://sourceforge.net/projects/libpng/files/libpng16/${PNG_version}/libpng-${PNG_version}.tar.gz")
+set(PNG_md5 "6c7519f6c75939efa0ed3053197abd54")
 list(APPEND fletch_external_sources PNG)
 
 # openjpeg