From f2e8f27c1578b3850202300520f646cb52d917c8 Mon Sep 17 00:00:00 2001
From: mwilliammyers <mwilliammyers@gmail.com>
Date: Mon, 18 Jul 2016 16:39:07 -0600
Subject: [PATCH] opencv : Add libpng cmake support

---
 var/spack/repos/builtin/packages/opencv/package.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/var/spack/repos/builtin/packages/opencv/package.py b/var/spack/repos/builtin/packages/opencv/package.py
index 7664a070006..b8774d852cc 100644
--- a/var/spack/repos/builtin/packages/opencv/package.py
+++ b/var/spack/repos/builtin/packages/opencv/package.py
@@ -99,6 +99,14 @@ def install(self, spec, prefix):
                 'ON' if '+java' in spec else 'OFF')),
         ])
 
+        libpng = spec['libpng']
+        cmake_options.extend([
+            '-DPNG_LIBRARY_{0}:FILEPATH={1}'.format((
+                'DEBUG' if '+debug' in spec else 'RELEASE'),
+                join_path(libpng.prefix.lib, 'libpng.so')),
+            '-DPNG_INCLUDE_DIR:PATH={0}'.format(libpng.prefix.include)
+        ])
+
         libjpeg = spec['libjpeg-turbo']
         cmake_options.extend([
             '-DJPEG_LIBRARY:FILEPATH={0}'.format(